Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0a2273699bde8c…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 21:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a1718b88383151b57ee5924f91f0676 SHA-1: 8c10af7ea5ab18e5507db3cef0df495f13d07adb SHA-256: ab0a2273699bde8c0d83ab5c02fe32ce94824c7089842748b968e8a611b4950b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, some of which appear to be compromised WordPress installations, suggesting a link farm used to distribute malicious content. The presence of a 'download button' heuristic further supports the phishing lure. No scripts were extracted, but the overall structure and heuristics point to a malicious PDF designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=tamilplay+dubbed+movies+download
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abda60c3748---46997780899.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/0b84b677c4c371e8f046c303506c5414/31535831596.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/pagolili.pdf
    • http://rauvuonsach.net/images/uploads/files/zevajojizore.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/90f0107681dd46b8bc186d5c5e6e54ed/rigivibebaki.pdf
    • https://zivotzaokny.eu/res/file/nijex.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fadef4e59447aba9c8544a8991fbbc1f/56898317605.pdf
    • https://childconcern.in/trila/userfiles/file/basoduwetif.pdf
    • http://libertyquad72.fr/userfiles/file/17798569386.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ecf724055886c34e632c1479ba4f179f/xifasa.pdf
    • http://atomleasing.ru/media/File/nepajufusajadizokurijuse.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/84bf972e352ead9f9260ea65ec0aac4a/bexelulededuvalepejix.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b9927665c---52055964264.pdf
    • https://alatheir.com/atheirwsfiles/file/45407369240.pdf
    • http://chinasoftcore.com/userfiles/file///pubokonigolazonexope.pdf
    • http://abwlargo.com/uploads/files/20566097595.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/gm4halq5s192o14bea54lcgq0q/82716930417.pdf
    • http://fitviewer.de/files/file/22727932469.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/luxikebijumuvivevuxija.pdf
    • https://baxsporthorses.com/userfiles/file/7540092967.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/ts9ja3vqb9bl9v9r9v38fj1m3t/26375077752.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/02odmf5c2a49k52s4g44nevqlp/62924085531.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e78dcdba8---24295908824.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_off0000f7d2.bin
70f0145e93571b87ccb2b130255efa1869207f1bf0040386a6e3534886ffe249
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 17196 bytes
font_01_sfnt_off0001248f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 16792 bytes
font_02_sfnt_off00013ca6.bin
344d461145c9320437d345a66c42eb1bfa18d61416a1ed5dbdadef6485c69832
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA6 10824 bytes