Malicious PDF — malware analysis report

Static analysis result for SHA-256 123cee832c536d80…

MALICIOUS

PDF

94.6 KB Created: 2021-06-27 15:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b93c4a70a5d1d1cb867c11966182db26 SHA-1: 8230e1a42cf22ea4375cc6433ec718ed0fb6e2c7 SHA-256: 123cee832c536d80d443da3adf4a53757b614d78c8beb16d8898da7654a149bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites with compromised CMS upload functionalities, suggesting it's part of a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities on linked sites. The file's structure and link farm behavior align with techniques used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/69f18664e7e9a929e7b69f6298f07442/rowogegi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c956328383---garupawilusodujogijonux.pdf
    • https://ktmcollege.org/public_html/userfiles/file/99882780715.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb4592ba8---lozudimutejofadavidusu.pdf
    • http://ecohort.com/userfiles/files/dudumopuriderikum.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vuwuvewexiviwirunelifaxuf.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9946098e---zojadulebusobi.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6eea4128---17290121848.pdf
    • http://sam-global.info/files/file/wabigefagi.pdf
    • http://galettedesrois.hu/userfiles/file/nuvarasub.pdf
    • https://subarini.ro/mm/file/22317366695.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d77deaa---67754231541.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/bevupukozi.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/64788345240.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a67937d2---xuxawetefegowebiwajitad.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/41021a59f09d57196bf05af202994b48/ralaferozovax.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/gav180f8totfrm1ov6t611vnbe/62105934020.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/16a8734c21bf3c6a4e10474a6da3375a/fuwuregisavepelalunujigod.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0cf0a737f8e312f0603e60bd686df70e/85799553139.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609829f89476e---xewirakujikoti.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084de031b78b---jibatuxedidowovalujamuxox.pdf
    • http://amon-syotengai.com/userfiles/file/13754209818.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c9ba946febbd6d49b846e57c08ae99b/filejugeniwitige.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=asee+annual+conference
    • 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_off00010e2b.bin
5d41a98ffcafaefd4219c999a1cb56644e8c2fcdf7657f5680ccdab3996a0602
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 10220 bytes
font_01_sfnt_off00012543.bin
eee280a66346c8136c05d58ca42458fe84baea86dc7e750046e3b040d2a6be5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 18272 bytes
font_02_sfnt_off00015594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15594 16792 bytes