Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92ea17d36aab213…

MALICIOUS

PDF

103.4 KB Created: 2021-06-28 06:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2e0c1a6837b7f22740bcb15fec7ede22 SHA-1: 7ba5c3e0dd2659a6d4f4a35daa2637c522dcf496 SHA-256: b92ea17d36aab213b2043d72da14023ff43bebd84357771582ce0480bc39d3d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as download locations for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure suggests it's part of a link farm designed to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qbljfnkkgefphep3qhntbtham1/84694365509.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/29npnbb7b536duqtcj1behdtm7/jirukoxikekoribuzom.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160746c55bd327---42049741334.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/fowomilezidu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/15fd79ab7dc32191a7b079abc49eb6da/puxafixebidagulobatafe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086ab5a64bf7---95052597585.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1dfa51a03cc8b58564c67e230ad7a8b4/sabowipejurezen.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e5d292c9---59780124694.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6q3s26u0snmffkekhqp3095fp5/50515989147.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b3c46066---41398056635.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29f28c2cb---58311864657.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/10a32a4a7e602db49ea7050ea9118ad8/batatomurib.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/sfqj43aj6o8rhmt61v59vhpeen/36354957530.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/99724684238.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nrnlcrvvhfso92kc08kl2jktk4/mepasojegufibuvujog.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/74032680720.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/37a3571fc79e1f97af3475f4ae50c136/52034630796.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6b19829d---dejozovo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c435f15bfee---vipidudapizas.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zibewazepegiduvanaxutu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/89472319645.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/lupukobarafumi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/528a9ac045066c3bfe932b37ebe8c31b/35800153210.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7af284bedd6fc9ca35f661cb212df906/97212246152.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07ddda845---juwojegosuj.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9cada08a---nefowewumefifaxutir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+tamil+songs+for+ringtones+all+timesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 17084 bytes
SHA-256: 6744a1beca15502f79e0278481a5238f5eff8f19cf332437d10fea55ac0658a4
font_01_sfnt_off00015dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E4 10608 bytes
SHA-256: 06bc9b133a2990c0f32890f5348186e00ae16d6fc1d4a2fd11116aa51b73257a

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