Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8a7f12cfeb9bd1…

MALICIOUS

PDF

93.8 KB Created: 2021-07-03 23:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b48b319d69744f3a11eccecd80a75435 SHA-1: 37e9a7cd81748989aac7f6031ec0c4b4a4b7be4a SHA-256: ed8a7f12cfeb9bd15c8da8041f66e988034fcdd63c3a2559c1132d9a77c8d90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and utilizing UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://philabc.ru/uplcv?utm_term=mk11+apk+android
    • https://betentour.com/sites/default/files/file/76597997407.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0ffe856d---fuzomoresuxibikupo.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d503efa90---10663137626.pdf
    • http://beateromer.com/bilder/file/74594913299.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/gudofamen.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820c4e7364e---44258751982.pdf
    • http://dh-life.com/ckfinder/userfiles/files/9190617665.pdf
    • http://dunajecbiala.pl/upload/File/86215658519.pdf
    • http://saothienemb.com/uploads/images/files/vezajasazepozemuzavak.pdf
    • http://edumedcare.pl/upload/files/simivuxitifefi.pdf
    • http://packamate.com/userfiles/56391866105.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/71e415946201db4d866117eaaa0181ad/foxakebovolitimuluke.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/69680988278.pdf
    • http://al-farh-iq.com/upload/userfiles/file/bubinarowul.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/801e593cc62fa954e4c63e2ced3d8813/82265383164.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/av04g845ai9245260qnucu34mb/neganibifuzaxemidazovifa.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe51419059---87597585542.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c697be60b---69486442745.pdf
    • http://elmbbq.com/uploads/files/fasovinesegetomewifu.pdf
    • https://alnahamgroup.com/userfiles/file/95880782321.pdf
    • http://alpha-cp.com/userfiles/file/43287695703.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a92c648dfbd1704bcbeabeba4ae15632/jilunovupesaxulusuxola.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fb8d6893fa80575cdd60cb13b088768/ditozogisevesarufojigus.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/notoxemenebogizofe.pdf
    • http://twxcd.com/img-aim/files/fujebodabogutuduwebe.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f445.bin
0791a6f7386b5369897a6ffe44fd9c5a195fb27bab0fb546c1a21db2911f44f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 16904 bytes
font_01_sfnt_off00010ba5.bin
0abf774881df81f798ba908fd1df3f6baceb89ad9611d66c0c79de2914e96391
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10080 bytes
font_02_sfnt_off00012224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
font_03_sfnt_off00013a36.bin
43f87da29abf9e21d3cad2610d4b69d56777fc6028c4324523afed80693ec323
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 17876 bytes