Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aca3cf610f9620b…

MALICIOUS

PDF

88.7 KB Created: 2021-07-03 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c93ab4787d6e14f823d7e220af710eb SHA-1: 953439330628a7bca0ff690c7c475c3f5d89de32 SHA-256: 7aca3cf610f9620b46f03c25447bc1310d2b3260f2ed0578b3b1d695f5d43c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=monkey+puzzle+seed+pods
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f918293a---roporijixefivu.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/zonutipuvivigomofi.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecaa130e52---rozupowovimuridize.pdf
    • http://brette-animation.com/userfiles/file/42375133666.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/tixibafevovapa.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb4c7f02c---36069259678.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/gimivolekubamimitek.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6711cf3fa---xofiketodipevovejavazoke.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ffddd519052236e410a0ebc1ada97765/23143552575.pdf
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/maragiboni.pdf
    • https://decoveinvestment.com/userfiles/file/towazabujawetu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ca8807d8---disagowiwukogog.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c023d86ebd7ef4f401137c3bfd752a2/foligoriwobuvufepiz.pdf
    • http://barudan.hk/UploadFile/file/20210521182142975.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9a8af37e951018ecab33ef2cf87ef9b2/rivobufetivebezofilaluv.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/82ce0c7d4fbda7b4256017beb0157326/64107708511.pdf
    • http://nhatngungoisaoxanh.com/upload/files/sakifozelolizowez.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/736d2c96030690b531f501504a489cb3/82535793804.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b7b69795c---misolepew.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0rffjjo5ru9juim5gk4g2tgk2r/godaseberorewa.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/69d35d389c883acc09d55023dd7c71f6/6679051761.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ifg3qgl465jmtgh3dsh1kgmbg5/23955078713.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_off0000f975.bin
fd18855f6abfb15351982d435e098a62409576a25b37afee8ffbd2012c2e095e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 17272 bytes
font_01_sfnt_off0001268f.bin
3d2302d350ede3adc9136007636519e6fd040ab3a0b7ab779f09dd52b66037de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 10292 bytes
font_02_sfnt_off00013de9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 16792 bytes