Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9422955d69dc12…

MALICIOUS

PDF

83.4 KB Created: 2021-06-26 22:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a336df5761540a48c2fbd4eea6eb991 SHA-1: 632adb4e3b2072f3493078d15ea1ed230248960e SHA-256: de9422955d69dc12bcf45c2473fef83140a13bb2b0d554f0f6d0b7a5326b2d8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised content management systems or disposable domains, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.allatpatikapecs.hu/images/file/poxivikeg.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8f44b37d39706d9de7b1dedc42c03e10/74088514491.pdf
    • http://redactron.com/userfiles/file/xobowusoxajeg.pdf
    • http://ideas4mypool.com/userfiles/file/mibutuxidoverabalan.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ac74c0da---nasevegarime.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/30592081844.pdf
    • http://nextgt.eu/uploads/file/kuvidomeno.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/baafefa9bcc1a0b0caa0ca5162a355e1/roxupuso.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffad4e41a2---fuwanatiwironavizojupo.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098acd8b7620---53104761810.pdf
    • http://flambotour.it/themes/userfiles//files/58217700961.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0b2e69612fc5c6071038bae007fafec2/fevukudodozebutufa.pdf
    • https://groupburuemas1.com/contents//files/19652273492.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/055dd957b217ab23fdd1e2a91fdb6567/lipelafemulamepurulebefoz.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/tugebepunalesi.pdf
    • https://burlingame.com/wysiwygfiles/file/lodinonuzidubakokawus.pdf
    • http://charivne.info/images/file/95069586368.pdf
    • http://jingchengs.com/jingchengs/ckfinder/files/20210620090819.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/34c1b860a1454a0aa836154c92604f79/jizimejikosixomimunaw.pdf
    • http://vietthanhstone.com/images/news/file/raludakuzisajodave.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3cspcnl1hv5k4osq3bdecc03j6/sumagutewi.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56017e6185---totexiruwixagadema.pdf
    • https://stopserv.ru/files/file/68616813580.pdf
    • http://fxmeat.com/upload/file/80dea7249ffd6d6f8eb1cb6b83c54729.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/nokuzubuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=all+best+prediction+site+in+the+world
    • 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_off0000e4e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 16792 bytes
font_01_sfnt_off0000fd00.bin
60018095fd8d8d67cadaab0624757fbb5c37b5dd5b5ca2fa7fd119046fc4d33d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10656 bytes
font_02_sfnt_off00011522.bin
f7efbb4a188c66163fdecc91f8bc6e7662924c5ac2dabafeafdd9c26822ad8a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 16572 bytes