Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a81bb124e2c159f…

MALICIOUS

PDF

91.1 KB Created: 2021-07-21 19:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac5ca08adbdfd55d03190fc1571a7da SHA-1: 3d4fd4e0f710cb424ffe10d581c3954a3b8e1090 SHA-256: 6a81bb124e2c159f9bc125d1ff7f4a35f5b8cfb0e21c58ff474e8470ae5ae25c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ec90d73b9d617861e89e6b0448566440/relesefivovanebenalap.pdf
    • http://iglozawiercie.pl/zdjecia/file/bobadafojodo.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/16911013638.pdf
    • https://brmc.jp/user_data/userfiles/files/73102052497.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd17863b3---zononetawipewinagojuluwu.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/h263gofhqlbm883ig24cspho21/29726909602.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/77e963cd5cb6d44b7b8f35286200c3c4/pezidabugidezuv.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074793d00536---detosuxusa.pdf
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/82f6f1cqm47ip1601i41h9nl8j/45523364056.pdf
    • http://phuocthuan.vn/images/pic/file/95531553985.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087736b80ebc---41341052293.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/79436173482.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55af39dee---75405709042.pdf
    • http://klccpa.com/userfiles/file/famuniwamamavoxigopis.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073369f957ef---zowadavijutaguxemawif.pdf
    • http://temple.mo/userfiles/file/10152711122.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/31117505062.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd1807e83c---fevojobatominikerubovawi.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ba6a3c03b3b2e7345020ec4aa4617b5b/kawawix.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083104c615c8---fexarerewedejow.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/821d4a6cd1b4345d8f58fed9f42b9915/podegawitobeb.pdf
    • http://personnelstrategies.net/userfiles/file/3007946396.pdf
    • http://yaqeen-eg.com/userfiles/file/komugirepuzutepux.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/38256817281.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32694a1c5---zasonurevuba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+loaf+in+english
    • 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_off0000faf6.bin
8afccbb32780ea816f879e27a608db9633acc4ff479a9812196dfad79bccd512
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 19380 bytes
font_01_sfnt_off00012cc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 16792 bytes
font_02_sfnt_off000144de.bin
f096b74feb530e2cbc8a8e1698d8d13355bec52a337f94c3b366c96dde738ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DE 10288 bytes