Malicious PDF — malware analysis report

Static analysis result for SHA-256 577b211629efdd60…

MALICIOUS

PDF

82.8 KB Created: 2021-07-10 11:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79bb32b048a86c04ca867364124e6b07 SHA-1: a85aefc701c5c1330aebae94fbbf716182a665e2 SHA-256: 577b211629efdd6042196c2ef1ab5eeb128573d9c3911040a1c58c85cbb8d515
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58858c69b---febudavuj.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/fujaxabobekufup.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b369482f209---xusilegeboxusewaxetep.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba39f1d41---mosafevirevaraw.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92f806384---52065402433.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f56c6cfc2---39856388552.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/51915496717.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db2151a1b5---lipexosifaturodimexar.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s58q1fdov5amns1b0djunvjam9/norarobuxotafugowil.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/wuzokufoxapefedexego.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/pabut.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ckdbh0vkjpmd7fiqdcsf6oamt5/53628598926.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096698313182---vapixuzugazotetepij.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/nasabimisi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/10334906586.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/92cb7f370fc844029679dd964f112866/sukidetigomi.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/53615501747.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/sariwepurajudorodewuti.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/zemijutisuviga.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d063f423241f7a6742c9b93918fe5394/28056563438.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/93538581037.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/40855595420.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/86953832495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=florida+video+recording+lawsPDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10576 bytes
SHA-256: 76cd4f7948bd7f9d393775c5e16bff94982e693521f5a664132f301e1ac2ee26
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 16792 bytes
SHA-256: e3702b91ed855fc9aeeb1d02a6c3132820fab52ba916586c04036015f04ba905

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