Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4b467efa52869d…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 23:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5d230627b181a18633a7a8faa0baa56 SHA-1: aa9048855b6e51f16c907a820a097bfb73c38656 SHA-256: 7c4b467efa52869da59ce2c97302f452d8b6edcd94294f450ff973a4af7e5be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous compromised CMS upload directories and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://etimes.mn/uploads/files/84428957409.pdf
    • https://congchungnguyenlieu.com/uploads/files/67009426648.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b4c9aaabd90c1f314b15c29079bd47df/84278300661.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57ddee4a9---23976717910.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8c88bef3f---xefutomipukivuseromixot.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8922a4c255a868ace70331d7403d3e94/bubabek.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086978d3c600---vibugonumenorakatimat.pdf
    • https://rzfmuhasebe.com/userfiles/file/luzudonatinupokiko.pdf
    • http://ilkyoukais.com/Images/Media/files/lodigoz.pdf
    • http://elmbbq.com/uploads/files/82021613977.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/jikiritotoguxomukixejapo.pdf
    • https://aawyx.com/sites/default/imageuser/file/fipaligadogini.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7bcce3726a53378e7ba09fd90dbe0bc0/3596784222.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6c93d4d9---91166779271.pdf
    • http://jinxinghotel.com/uploads/files/tagupidigovuvenowivav.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6drhulltkupll1acu2u5a98e3/49454457457.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22cbf2962---4240275343.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q4jk36cnvi5kgmm37nsafsaen1/61458770789.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875c0b4f93---jegafagebava.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9262547c472c3333217cf5b9faa63a21/mulopovokelekubodulu.pdf
    • https://bnbcostaverde.it/userfiles/file/29172935771.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3c7cd42599dd80cbb3a3bc09ec8d52b0/gedejilofijapazufi.pdf
    • https://meganimal.pt/site/upload/file/61955935666.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=define+magnetic+declination
    • 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_off0000ee10.bin
e09c96a1b12b2f1a40e432179c8bb04ef279ae7c87a99405fe5c4a01e3e8c9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 17656 bytes
font_01_sfnt_off00011c91.bin
5fd2873473efdad993219fb5eaa6aeeb9525ba34470d29d6ec47d9956644843d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 10552 bytes
font_02_sfnt_off0001345f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 16792 bytes