Malicious PDF — malware analysis report

Static analysis result for SHA-256 13656d70a740f7e8…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 06:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9857cd1a90b3912cc5c54c4c2d463eef SHA-1: ffe73a1e32adf4e12ccce1f9bfb940520bedb502 SHA-256: 13656d70a740f7e8ad3d17aabbf6fcd18b527e91031d181b7625795e290cb07e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing the user to press Win+R or paste a command, which is a common method to bypass macro restrictions and execute arbitrary code. The embedded URLs and link farms suggest the document is part of a phishing or scam campaign, likely leading to a secondary payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=outlook+can%27t+connect+to+yahoo+mail+server PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4558da5a---morosukuva.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/80525461846.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/33083564041.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2k36vi07ethpeq8holn0jsfi69/19665819590.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dd974a5f---bisafexaminejogame.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9nl0q6sco8cjiu7ovmccalbl5p/12247206898.pdfIn PDF document text
    • http://fxmeat.com/upload/file/20d744297566de88f2e5ff3e05bc94a4.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/miguruninegujatipuliteko.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/40722165572.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sfhpi4l298v1tugovk6hle2e95/9315477003.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b23328b7---vubajamaru.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/15520759175.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a2338643---17982950186.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kbnkjugdnrsfl5vsftvbum0jom/tatotuxinofuv.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d81opbcupqivv87bq5p52r2kia/gibevupetufeselo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720fe868bdc---79631434272.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/53332218686.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25dcb82aa---79835606365.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609898ce16c8f---37525512446.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c538d63f---54456352111.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0165e141de---ririnezuraxewi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a32ca4e98ae---nirozixozosovofovuxoloj.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/fajifefemojuboxawagok.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/98683222123.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8798a530d1---vamexibotapekuni.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4daaf46a97d988a23b118114b388844e/velikabe.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/tirozo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 16980 bytes
SHA-256: 3fb99d5ecaf2bbf22548acbd353938aa782bcb829281cf0d0d6522060334a18b
font_02_sfnt_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 10928 bytes
SHA-256: 31f7ceb78a421bf90cd4f9c342d13478e016fb797d8c711424746081ce8b8ded

Open this report in the interactive analyzer, or submit your own file for analysis.