Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d283e50098e49b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 06:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 879342f218097a6df463472413fc55d2 SHA-1: 2565487b9bc2d48fe8336f8f9241ac6ddaf0f469 SHA-256: 72d283e50098e49be79331e31ba75406f62b3c4db7f14be686ce9f64d9635e66
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, while some are marked benign, contribute to the overall suspicious nature of the document's intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a8d5c03b---mekofujakag.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d905f3b482---ditonigujogozivuv.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098473010087---lubisidigoguna.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/38682983524.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccceda3842---35604581110.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/muwaluj.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/29178886337.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea4ea52c5c---xilunisozojenabogesuxaxid.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k1eur8iqrnmlvibs5trrddoofq/xipevufezematilaxuvovuson.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/puzub.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d58bb26f---posazazidimojipojerenaf.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/fidosavetososif.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/75860389984.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ceff9dc8422---70978386265.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vujofojifuvaxofa.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86894920327.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/i6p4a6lt65j1nkgrsh7ma92a03/misupijakebuwinurarotit.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/57hniifdgrjkqdqsdh0fk2lik0/mikata.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2311c56a9296e4019ed1c410806ec246/43829024493.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/37765171182.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hslfsvna3ginvmqkvv5q64gd26/94882900124.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/juxitikipofalut.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/vinivogugin.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e77d1921ceecfbccfb85608cdf05754c/63536163146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=civil+service+examination+philippines+reviewer+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 11168 bytes
SHA-256: 370b7298d12e0d09e974eb3365d58f6295d9baba37555920a4b9c862e636efbd
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 18264 bytes
SHA-256: 3272695a37a6882a87693c80c1934482d472ac5328a897cd0c052256a05dfb7a
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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