Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a6c7852850666d…

MALICIOUS

PDF

141.4 KB Created: 2021-07-14 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5f5e47ad6b11110130755236f84bdc42 SHA-1: ad5690083f9dd340acb78ac8f4e27efc48ea2579 SHA-256: d3a6c7852850666d397f8983c7002947ec54a7c83ad67881d4d198eec3c1f4a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3fad1fc68---82351906190.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7a37ef6f2649ff679941bc686cf45204/fazakesafi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2d9d883f---2529718054.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f774e79977---96489251343.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/fotubadonukeviwutug.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426945b557---wivozaregeten.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077242c59f46---ridigabomera.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd305bcf34---89995146056.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c1f3690542f56d7acb5f01313359f8a8/33165447916.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xaveturifep.pdfIn PDF document text
    • https://ibextrail.com/editor-images/lowefu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/466408a0053effb26c7c08287d6b21af/9170323509.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/96408282000.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098c1212ab17---vejenukomi.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/disogojebememovu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b62012a1e69c57d177b400710cdcba88/33124048274.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/dekadi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zijizimoxaxosufalitidote.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/talinekerijupopum.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/bepesu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ee64532297c2bb33dacfb4e5c6dee37d/19765083050.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb313727b---99279355891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sat+march+2018+international+answersPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 11160 bytes
SHA-256: 8b9dd66227279374d1cbe59ee1135f43d3551bacdd0f6b09250d843c02702540
font_01_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 19480 bytes
SHA-256: 506fab40cd00ae74e2fb99d3422a25fc85cc2dc0556f4a3d1cb8d2ba2e11342d
font_02_sfnt_off000151db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000169e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E9 74884 bytes
SHA-256: 07538d2fe32c33b2c074b0a8eddfced42dd8004a613739c5e9b6be9c0ed06d25

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