Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b86df0d8b3fb71…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 15:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34d664a4b259753b03aeb4d9d4575d76 SHA-1: cd4dee4cd8aa768bc58517f2a22a3cf5c69c94a9 SHA-256: a2b86df0d8b3fb71d90c48bf6922b3a7edff436a39b7df22fb3f9d5c64947d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host these links.

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 https://huntic.ru/uplcv?utm_term=pengertian+sanitary+landfill+pdf PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfbccfe0445d114c7293dd52b08c7805/90124980929.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2594135065.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/95994908749.pdfIn PDF document text
    • http://philboyd.com/99575066926.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15af649a9---75012793842.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/ronaginejisefotevijikewif.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/18611106371.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb00181b2---26351103299.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/70980989425.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/34457309291.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hk2tsrorn1m7qqi0qogtuemuur/53806952205.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/zokilidap.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/39045672827.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be0df085814---13351026734.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bd89e251b5cfdc66215032039d965093/5321309986.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eipu8slt5eodep02an351s9660/gixamufimamilitab.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ff883376f25a5b0ff3c2f4a5ef088d3/34553810515.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a54j11v5o3ia8cagae3ojkth9o/woruxu.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/40621062031.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/21936803908.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/75657915141.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/49371995740.pdfIn PDF document text
    • 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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 10668 bytes
SHA-256: 4155cd0dd3243cbbfce0fc840deb0c9f366e572607833b8c1b37e4823fb674da
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16836 bytes
SHA-256: 6dcbf43dbff87d93a5344bfebfbe6fe579b3cbb50682fbf5d396d6edfa44b4ac

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