Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b87399ac5bfe01…

MALICIOUS

PDF

88.1 KB Created: 2021-08-19 18:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3af30e6e2cb93e99b93d479e5d51c691 SHA-1: 2c3fce814f29f328dae616461ad1143ad2b1d34d SHA-256: 96b87399ac5bfe01bc3cdd2b72e91226978f73e267c4e541a5cbd70f709fcca8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules detect patterns associated with SEO poisoning and compromised content management systems used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://mpu-beratung-brendle.de/userfiles/file/27830312075.pdf In PDF document text
    • https://actorconseil.com/files/file/puvabufaxalamonuson.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210710_ABD5F0DC1FB99C44.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/988a039b5afcd149e8ddee45a1cda732/nimudumuvokajepu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ccd6e352867cf6a02c16753c723d901e/41566500497.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7jqn6c6potuclnjmamulmh051g/16622974726.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/90729845038.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6363104ef---paweka.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/fkcrkjb0cjbpv0cjlpq92iprul/xedapiv.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/domavotiduroxavizaxezavim.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/69591913958.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/91142669917.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/jowatovozuxunokezemefuwod.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2fjdf51cq4k0g894kekvr9v6og/fuzemakoboxeturisunif.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/39726362002.pdfIn PDF document text
    • http://www.polni.si/Images/files/famoponuwuxanevag.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/7048473696.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2fe36123---75308289996.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/78809103653.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/57120515348.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/wifusinujagipo.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70595561892.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c90799d9deb---tafelujutiwuzusaz.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8a6b41d6183cfe364c8798d466e30449/fubilodilamajasom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=que+tipo+de+enlace+es+el+acido+clorhidricoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10768 bytes
SHA-256: 0f2fa69537fc285ab8f2135b7bd405481138c97e3271ab58f0dec1e76b7341fb
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 18460 bytes
SHA-256: 37a70b355e52e27e173e577dd30474ace87af83eab394b4c8c6e9c219abb2e53
font_03_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068

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