Malicious PDF — malware analysis report

Static analysis result for SHA-256 6860ac2436dd9ab3…

MALICIOUS

PDF

85.0 KB Created: 2021-07-22 14:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89cbd3e6c196eec7ae879641207962cd SHA-1: a55d1f89600153f58611bd44a9be585b13c086ce SHA-256: 6860ac2436dd9ab3269ea022d0fb4825408881ca1741703621bc9f43f2cfb53f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aafdc5a36b3---68722626987.pdf
    • http://kemenyseprosiklos.hu/upload/file/kelilobiwaloxotos.pdf
    • http://iburgisidimarsala.eu/userfiles/files/pojasebedipa.pdf
    • http://xiaohecollege.com/d/files/12254943367.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d907f8f79526c6e08295674ee6a8b374/nudurabokesunotufojuli.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160df45554a9be---12754527883.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6cb87e8ce5465e6bc920efa6236980d1/fuzagufufuwutibaborobemo.pdf
    • https://lesfeesdelhetre.fr/upload/files/61854098500.pdf
    • http://korean-school.hu/hangul/userfiles/file/7733156476.pdf
    • http://caratow.nl/userfiles/file/64951369667.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6a65f0903e3bd699d12bb6507051910b/dutite.pdf
    • https://dailyiat.com/html_upload/file/79262111976.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f866d67a---guvugubojiz.pdf
    • http://adamlegal.com/userfiles/file/tikupuwimuberugubos.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fdb35768e---53515844221.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/98282983967.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/21339c027ff78cb6693ccf8049566096/52448595693.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ue7llhdphacl5qff72eupo5877/xonasijumoxevifuv.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/04dc051c8b814aa643f7a6b3883c856d/mopofowekogij.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608697bed6880---27793601159.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d1540254---65199617582.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ec4p4ppbarp76fto3ef1ukhrsb/kigukenedaririvotojuru.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/ab1d68be97d91e7aab548a88e3ede134/50198200744.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=10th+last+year+question+paper+2019
    • 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_off0000e573.bin
cb27aea3bf8c32bc57947cb76585aae875890c3807d880d9bdeae4b91b31db5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 11076 bytes
font_01_sfnt_off0000ff45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 16792 bytes
font_02_sfnt_off00011757.bin
1afcbbbe2b56d730ce16d57f28e046e789fae6598cbcb6b681bdbe4cee1e2213
pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 17568 bytes