Malicious PDF — malware analysis report

Static analysis result for SHA-256 744084d4f2fbefab…

MALICIOUS

PDF

100.3 KB Created: 2021-07-14 08:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8ba6d820714080cf6c40b1d064126b9 SHA-1: e4052087f74c4acd7db35d71caf4ed9357cd460d SHA-256: 744084d4f2fbefabd561f6ef3a3950b01c2959ecd73de20280e8d4cd49c6dc19
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised CMS uploads or disposable domains. These links likely serve as a distribution mechanism for further malicious content or phishing attempts, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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 http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/10654627043.pdf In PDF document text
    • http://bielwod.com/userfiles/file/63303861708.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf3a812ce9---zovodizuximutadatoguwisuf.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14217755933.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gejofabajovojus.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/82854488657.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e15ae6f9c7070b3bd5a4cf3543334be2/59182395190.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/81380851018.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/bogigokisexovuzudozorapet.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1b625bce---josetoxewopogirazojazuwuw.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/26183524652.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/fapoxilob.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/sedegodubaxofe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d108f2f917---rijatigowuxomemavopusu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d117ceec.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609efba1d845d---todijavuwagurajejawikub.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vitivikesusanuz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ulpd4rvug7f9fhssqqap9468ep/82102804728.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/84208839899.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/770e50b1b6725e01afeb1f3323a3f101/josojagusasakukufizujor.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/zilibupoke.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/27256438420.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40881127073.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/55006342162.pdfIn PDF document text
    • http://liyangah.com/Upload/file/bugipa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf09bd150---pewetovarutofodabon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+2+tailed+beastPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 21852 bytes
SHA-256: 62da68f488d64c05b4446e8d0b1daf0751da158bdcba375874a549cb650b318e
font_01_sfnt_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 6576 bytes
SHA-256: a9519ce2e44743b3498424a313ad630bd768e7f51127e2a9474024b05ac5a4a6
font_02_sfnt_off0001544e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C65 10244 bytes
SHA-256: de6399900a13d66a1bcc1faa1c4ebdaa4a88f6e42ba72d1a74f71c937837e2ed

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