Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af61d06cc4e27e4…

MALICIOUS

PDF

107.2 KB Created: 2021-07-04 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4430e60769d10490b99a3d9576e88d7 SHA-1: 64f6ce7b77cd61a2ef87efcab40a89381e5a4224 SHA-256: 3af61d06cc4e27e42c89bd79b742d585f734c9cd6ebf8932d5d94a1a0dbc0849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous unknown PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/skdvtp2d2j15h1mtathcjfkgqq/tetezaf.pdf
    • http://aqbnb.com/uploadfile/file/xozajuwafu.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609886ade5a3a---5945836186.pdf
    • https://nasikampung.info/contents//files/39494346489.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f8694202---60161607524.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f03ce1369---pukolobozorowovowexotosu.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/450b021e6acff67f339c0c65a0dee807/42656703560.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c58f21703---gimalorapinulaxarugu.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/cde0ba71e6251b3f8f825e059623efb7/gademabirurul.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/jenewujinaxe.pdf
    • http://asupuro.com/user_data/image//file/59396224718.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370ed55647---mugutinunufanepexobowar.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b992e9704ce---97019018639.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083075f18e5a---vagusumavokevaj.pdf
    • http://cuanhomkinhtoanthang.com/media/file/59379193123.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb453753a9---nuwebatixuregiti.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6afc06fe1---59775765250.pdf
    • http://chikatere.com/Upload/files/74642741543.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2jvq13ncdh9q1j69e5h2qmdb92/nogipebowatizijupel.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jsar68uhlc193dd6h01b04bf41/74312251985.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7f053b42---lotibakebideja.pdf
    • http://newgatedesign.com/Images_upload/files/vokolanu.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/qvct6h2f2dv8ck9uk84ve408ga/68584636635.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095b83a2080d---94950087037.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aggie+may+chimney+sweep
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013af8.bin
6f629d586c03e3c15774ab596b3f6314626615a8ced27fa4fa8b6ba0455f5b63
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 19664 bytes
font_01_sfnt_off00016df1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF1 16792 bytes
font_02_sfnt_off00018608.bin
4040215b6fe0e4bd49fc9fa5eb6967c017c8ea1f327da83284000094c6d25e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18608 10636 bytes