Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e85bae039fb980…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 05:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 204d55f86118f2e8af6a3d1417945ad7 SHA-1: 40ad1742e6491a51db48da1a8ea93b6114285a8f SHA-256: 38e85bae039fb9800021b07da2cafabab5cce2fa7e9d88c61dc393c57558a3f2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1dc901e4f6a3b83b7d4c6799f25ecfeb/7126636476.pdf In PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/28769619753.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/gevepi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e4f60d15---gujigop.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/22416445336.pdfIn PDF document text
    • http://haki.vn/uploads/files/lokagevamezudeku.pdfIn PDF document text
    • http://elitvorota.ru/f/file/71102518951.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f85e8a0268f---zowuzufaregapexenok.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/46712169089.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077846b820e6---zurapawenewexokepomutakux.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/lujimevomol.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc2a0d3ea9---75691689434.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/nepubupopobisebavi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0bb380b76c48633aa78c8073429797a0/xofuvaroniribuzewapodomiv.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/86919269444.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9cc10c205---forozukoturibek.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/pujul.pdfIn PDF document text
    • https://luminex.pl/upload/file/lunoruzuruvubef.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/dapikebogafolasinogimuju.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/73943385760.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zukiluwusokuzodivasi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66079d0a4---84546846977.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fc1db05fc691c2c1bfeafc848aa6c3a7/4563717602.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/malufafoz.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210802162503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=slope+intercept+worksheets+with+answer+keyPDF 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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 10840 bytes
SHA-256: e21fee41e2c7f0a63ae0648c7b5c2b32a1e3211a827a0c783b3ff50b08df3684
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 18124 bytes
SHA-256: 3bb41b0fdf6ac6b66812e7a2e87dac86ea025e2f204b731c845c13c2704cb4a9
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1