Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0a39bf50e557b5…

MALICIOUS

PDF

95.5 KB Created: 2021-09-18 18:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 499807a8d262c021f588c66a8684198b SHA-1: 4044a0cf3b0097b24b4d7190a88c6684a9990d4c SHA-256: 0b0a39bf50e557b591e0153b79caaed21d297467c7e10a338fbdf44625651b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135278af235d---41141922471.pdf
    • http://slesnick.net/userfiles/files/22822899366.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/25134551083.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/gepogibowiropuwat.pdf
    • http://stardentalcare.org/userfiles/file/65291232791.pdf
    • http://mtjjt.com/2013/upload/article/files/210914104600950692n9j6n.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161454d637e1e5---23237893087.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/vidulasalozupega.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tabad.pdf
    • https://peisheng.org/uploads/ckfiles/files/6134fe8a218f7.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210903_89FB4403B3AEF2EF.pdf
    • http://www.sandipmallick.com/fckimages/file/jurifuruzufe.pdf
    • https://kindeeyudee.com/ck_files/files/mosemawurofamudaliragiju.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458c0bb58b2---tined.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/bld7ha43d1oeo9qjlqgp9hknh6/vusujizugumefinojerani.pdf
    • http://apexnepaltravel.com/userfiles/file/fuboligasaxafativate.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318173d2efa---fovupo.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161365b4aaeb18---23495251055.pdf
    • https://petribax.nl/userfiles/file/37574361449.pdf
    • http://ajarnveerapong.com/UserFiles/file/kepadukowenurabiwitujidig.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/54119821e49747642269ebec5f91eac7/xewawulaxafebaredezol.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/3677330116.pdf
    • https://sanidom.pl/img/file/pomap.pdf
    • https://mamap.in/ci/userfiles/files/rilajo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=super+hit+old+movie
    • 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_off000110b3.bin
29926cb6e3f00ec4e3479b5f1879930187b50ed2dcfddd9912e63a126c9939c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 10464 bytes
font_01_sfnt_off0001286e.bin
41a8ea62c6933d05af9367a57e13ec01392e7ba3be51901332993f32fe350248
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 18720 bytes
font_02_sfnt_off0001585f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1585F 16792 bytes