Malicious PDF — malware analysis report

Static analysis result for SHA-256 105fe1cc18ba4fb1…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 18:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 021e276eb0dddd6c63e7d487402beacc SHA-1: 934015edb79a1e724de90f8f7885fdd1a71e5dac SHA-256: 105fe1cc18ba4fb1f00f6ee8a5ac2e37602a746425772d7375b4fecaf28dfe4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://atallmed.com/userfiles/files/86649751813.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83bf5a53bc4605c13b132f0f7c3c6e0a/jomokuwi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4f232808---92158459690.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea459f11---69953533726.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/211c1830e2a109b4cf85128572e8c090/11687270873.pdf
    • http://beerskiboot.com/img/upload/file/48761425588.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5k3t9q1k115v4393j0rss8dpr4/33593740693.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c614d684793---67273922479.pdf
    • http://oreade-breche.fr/userfiles/file/83403982736.pdf
    • http://andrelandberg.com/userfiles/file/serilunibexar.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ff8e16d4803afe1a5158186dc8ebc3b4/85620757156.pdf
    • http://begemot-rus.com/uploadfiles/file/2021063014313673499.pdf
    • http://straps.by/ckfinder/userfiles/files/zitugasimaminafez.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609013c91a7a0---gupazawimap.pdf
    • http://hopkins1983.com/clients/861771/File/44946967448.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/xaredanubesuwevoxep.pdf
    • https://ost-fogging.com/upload/files/murotirafipidixadazijezu.pdf
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/29254434198.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffca4b60d1---zegaxixiteruj.pdf
    • http://energy-labels.com/userfiles/file/lasemababatanesepoxoj.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3063509723---gusamixo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+selling+book+genres
    • 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_off0000ecea.bin
6657451364030121a8c36cc0affba8178a643c7d7663f922a0a358c3e441623d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 17616 bytes
font_01_sfnt_off00011b35.bin
de69de8b326774f1cdd4ee0263d03de7339dcecd202d8fe1cc0594477e558742
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 10408 bytes
font_02_sfnt_off000132e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 16792 bytes