Malicious PDF — malware analysis report

Static analysis result for SHA-256 561028fb4730ff94…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 16:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95942de6c0b62eb2b8622b12ca74267a SHA-1: 3d566f9b9c5b9cc44e69ddd64a8ef3d8fb4a34d9 SHA-256: 561028fb4730ff94ed291acb13d231aa7271d1eb1d031bbacc2b088f34141990
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f3d9dd3c9a0ca629c60181e2073760e4/rapiniwokerubev.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s1pmljjnhk5phe4hamuft5r8gh/39613612316.pdf
    • http://temple.mo/userfiles/file/dezijevetedulodosififuviv.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/derh2s2oh67il054s3noc5tmj9/76655771339.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abde30d43df---jilanate.pdf
    • http://sklepjola.pl/userfiles/file/kunosukegudiwiwepexepota.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/301444540c9b1f6da9028ae978d402f0/keninefokabadufijoba.pdf
    • https://drticket.ir/basefile/drtiketcom/files/ziwemepuraduwukipusologoz.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160953bc12fa29---zipebukovononurom.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd422c4b1f---36015426117.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e49d06a6510933994b2695beae4e4eec/kosati.pdf
    • http://szpk.hu/_user/file/68047933193.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36274cb4f---futadupuv.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825483789d1---veromivogakababij.pdf
    • http://bjjiffy.com/upload/22295898169.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac181516b6f---92928629951.pdf
    • http://libron.pl/fckupload/assets/file/48420903059.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c75e2b2be---79165246650.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9d526624---77595177415.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8e15efad---jukarugekalomuberuluza.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/99732520305.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2027af535a67654495dc28a5efdeeb9f/94342306888.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=grow+fruit+trees+in+greenhouse+stardew
    • 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_off0000f09d.bin
a55e8d4849bef16bb2db2775b13e5a0a849d42852d3f8f99008b92f6de632e85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10812 bytes
font_01_sfnt_off0001096a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 16792 bytes
font_02_sfnt_off0001217c.bin
d2f5cd72cc9bd174d81fb39ce75f0203a68c87b61e1c04152ff2215098fd1267
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 17184 bytes