Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f858ec579cb1295…

MALICIOUS

PDF

100.4 KB Created: 2021-09-13 14:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1689a73310672c6fff01df0ba4569117 SHA-1: 87970a1cc55fd67269b851d73921ee17ee29e282 SHA-256: 2f858ec579cb1295f84b7d22b65c3076c1a2346b14e543dc63170193479e0190
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host and distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613340ba8bceb---zutazujatebijoxibuluja.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/492c4999330837f46c6b586340eb907e/87167715945.pdf
    • http://progettocecinacuore.it/writable/public/userfiles/file/79887951614.pdf
    • http://galsabino.it/userfiles/files/20729083061.pdf
    • http://mannaz.pl/userfiles1/file/90198086486.pdf
    • https://univerosg.com/ckfinder/userfiles/files/93155113694.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/26353916731.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/govasomilelubasitufiro.pdf
    • https://hotnewsmd.deca.md/upload/userfiles/files/kisifaxigajoribod.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/94a0e17ab06231ef59dab1d301ee4715/dabigafule.pdf
    • https://renesens21.com/ressources/upload/files/61419196977.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/soxefoluxawanikif.pdf
    • https://maxtarget.by/ckfinder/userfiles/files/vilirewutun.pdf
    • http://kangshi-you.com/uploads/files/202109012302311694.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613463ba6bfe6---xisox.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/worinomuwevila.pdf
    • http://balade-pierry.fr/userfiles/file/98786126447.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/27677239503.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf28a6418---gowunoneb.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613763df1351c---63025196323.pdf
    • http://urjabatteries.in/userfiles/file/sozabi.pdf
    • http://roycraft.ca/userfiles/file/97784576686.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7a28d722---4796289359.pdf
    • https://lhorizon.ca/uploadHorizon/file/zepulirotobelawujaxaguj.pdf
    • http://tw-tms.com/uploadpic/xw/files/68597301760.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/57143068514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sat+paper+2019+pdf
    • 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_off0001251a.bin
64f3ae9c4cadfa17813eade9a25232fa152f0ff7780e55b9a4de37b431738872
pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 10500 bytes
font_01_sfnt_off00013d32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D32 16792 bytes
font_02_sfnt_off00015544.bin
52272b3ba738d43e9bfd7d655d94c0703c21b7e95cc0bf48637969b3b01d77a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15544 17964 bytes