Malicious PDF — malware analysis report

Static analysis result for SHA-256 8427b24ab2bc6c0d…

MALICIOUS

PDF

86.4 KB Created: 2021-08-03 20:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf4774e5220c2d06e74fdcd4265b2615 SHA-1: 46b1349076b609411e4a0bd79c95fa419cfb098f SHA-256: 8427b24ab2bc6c0d419feca7398349d6e21bc3dc718f288ad328c8c42101ce36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bbgpiti.com/userfiles/files/xidarutimunomazoxalep.pdf
    • https://eyetracking.pl/userfiles/file/84905719812.pdf
    • http://netmode.net/app/webroot/uploads/files/nepisewuvofefalagipelet.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662a17e896---fakanuwizujulaxizijokoraz.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/90649875384.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa4a04b8a---veriduxirobupinowal.pdf
    • http://iehyun.com/editorupload/file/kugatesuvitifoweja.pdf
    • http://krikrik.ru/uploads/ckfinder/files/mexuni.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/bunuzawisirimifukijafenit.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c5edb91f7dff3c91b411300ccc922770/fojivolapa.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f25295d5eed---totawamijuwizoxu.pdf
    • http://lalinpress.com/ckfinder/userfiles/files/70443696193.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/92ed8fb6fa117e519d43bf2ec100d364/60810099350.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033507403a2---xoxaledewafizirop.pdf
    • https://bazab.ru/ckfinder/userfiles/files/tenunifujofowaxadiseb.pdf
    • https://raljob.com/userfiles/file/gikowu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sj86ccslmnk18rnf3e6rccd171/9237287909.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4af8918330---zutimozewirawuvuzo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd78a50cbb9---35830495843.pdf
    • http://ypdtools.com/ckfinder/images_store/files/41881789033.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5db110dbc---40547934873.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ejemplo+de+delimitacion+del+problema+de+un+proyecto+de+investigacion
    • 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_off0000e7e6.bin
d3966fa0d114b7cec2db1655e163bb12c1b6b6e61f341997a5632558a8524392
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 11392 bytes
font_01_sfnt_off00010242.bin
58b723970da132d572b4dd74f1c9542ca39151b98331ec53c459a40627244bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 18432 bytes
font_02_sfnt_off00013128.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 16792 bytes