Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ce0e2ffae488aa…

MALICIOUS

PDF

99.3 KB Created: 2021-09-03 23:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47e68c3e4766f695217264e31833ccd0 SHA-1: 0a919c192b600fd5261efd73293a2485b3ab5192 SHA-256: 17ce0e2ffae488aa7fc455362cd77ae43a6d9075e9a58fd1dce9755471d9c74d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=hernia+de+disco+cervical+causas+pdf PDF link annotation
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/aa1975d4fbf9252678190b3822a0d703/linama.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084722fcad60---wufudaneresifogomovavop.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/dulafetotiwaguraxug.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/fuwenamorizufi.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/lidebomopuzobisufidiwo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2e6b84d4---gawejoxupowejidu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161251be5143bc---ledera.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b0dab443fa03d71a999aac76f5eef0a3/8798312488.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc16be99db6---filozipabivumatob.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vqfq92sd1maegp06sd4ql45ntv/kidinorejeturepagun.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/75717961533.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc24d10e99---jujabavegokexajan.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/63bae22af3e45d0315ab4e80b116a4df/wugulomafisowopiditibej.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/defilovadamu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/tediporezifefep.pdfIn PDF document text
    • https://laser123.com/geektic/files/baredelibuleno.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/48753152929.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/246qc3trqj7slfqv980jc8spv5/85712499944.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/69584338497.pdfIn PDF document text
    • http://hydrem.ru/images/file/62913865313.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e6d14e94df507a81d96051662dc265c6/48120850562.pdfIn PDF document text
    • https://telenovella-bg.com/files/kevabodonaxopametovip.pdfIn PDF document text
    • http://etnorom.hu/pictures/peburixozuwugedosuwetamep.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_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 18548 bytes
SHA-256: eb127a963614cfa3725cd4ff7d09b4f647d64161a4f5561918a02196d5b8cd70
font_02_sfnt_off000166b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B3 10672 bytes
SHA-256: 8dee4dcb7d96c0a2ace17df89c2a7fd15a75e9aae0310faed2b9bacab6712026

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