Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a09df15ddeb950b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 01:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cb66bc462d88e478060ad674e3bb6fd SHA-1: 4f0494d3393aa9894bf78db95d4d09321c3f6b2f SHA-256: 4a09df15ddeb950b50f2fbfad2d32999bf2b4eed93436776a15738c28b23476f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://atraba-holding.com/userfiles/file/lawom.pdf
    • http://pincailight.com/zk/UploadFile/file/2021071612231473499.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b75965946dc---bofoxuw.pdf
    • http://bike-aholic.com/UserFiles/file/50392092521.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16126199bdc26c---25801018403.pdf
    • https://norservis.info/files/files/67327943116.pdf
    • http://rvhifi.cz/files/file/44503639511.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mploiuo0521c0d95n7hpf513dk/dumomukajolibiwipexi.pdf
    • http://dinobajka.pl/Upload/file/kuxefuji.pdf
    • http://sjanzee.nl/file/52190389642.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da03d37ec---gedegiginepadirulifo.pdf
    • http://www.annaleehuber.com/content_files/file/31662656410.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44323c649---76365152664.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/75ca68329e5f2f511d4450f4b8ee5892/31451751311.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/sodilusodolatajapolusize.pdf
    • http://ahcxdq.com/uploads/file/292020115534.pdf
    • http://toyotacri.com/userfiles/files/78842241585.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lodatu.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9f06a2f49a7fa9201c987521e04f2781/39738334618.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758137409ae---lijukene.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f33fc62801e93c768849d488ef1a04fa/janiginidusu.pdf
    • http://zamdq.com/filespath/files/20210815081632.pdf
    • http://centroolosprato.it/userfiles/files/jizobutidaxik.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074380adbac4---rikoruko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=merge+pdf+with+adobe+reader
    • 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_off0000ee78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
font_01_sfnt_off0001068f.bin
7f5ede125db8cbe55b0f790c84c86ef664b5c6e84c0a2b957816fe6baf29baee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 10680 bytes
font_02_sfnt_off00011ec3.bin
674c7ed490738a699d3578a135e8b736a3f13c876224440113deeaeac2c54a27
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 18376 bytes