Malicious PDF — malware analysis report

Static analysis result for SHA-256 312ffad71e8a84dc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 19:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2d13330451dae29590ad70a527eeba3 SHA-1: c92112cf4e89dc55f9503e3a1be49caddc77699d SHA-256: 312ffad71e8a84dcfe53af4bf0286d1347efae6e9498b6ea211f37917a5b4c28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs hosted on disposable or compromised domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pokorny-podlahy.cz/UserFiles/File/pifavokufufisebop.pdf In PDF document text
    • http://qdsenfeng.com/data/files/88669634285.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/wexikadijefevanonajanek.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161441b417eb11---30908752191.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/51756857295.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/suwixatuxobani.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wujifufirexara.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/vimefosizotuvad.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f056ebf82b93ee7ebd18c01e9cdada69/62077255893.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/dokumopisegezojodujadowov.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4010726067.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/52717572548.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///60663054127.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210901123354.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/timutubidezulomefiforin.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/rotodozakidesa.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904160811_991604190.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/33459429465.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/16521921130.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/70372828333.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/faguponeti.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0dd4b3de9---bonarapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=video+kesip+birle%C5%9Ftirme+program%C4%B1+androidPDF 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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 11224 bytes
SHA-256: ab2cc3eb8e95a6dd58a297ffd9f0bddab5385a0bcbefde2c28a75e6f0fc17006
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 18664 bytes
SHA-256: a9807fa075d2c80c938582b4544bd1e1f16c6b31af97be8cffc86bf3a31585c1
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1