Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f14520e1ded50c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 15:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 009e652f8c0a5df57892afb8e9e25748 SHA-1: 7ebe51bc46b39838f0ffa8f4842e59b22d621c62 SHA-256: 98f14520e1ded50c03acaabcab057a916af00bf7cfe70adab1720d3f99914907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or to manipulate search engine rankings. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://bwawarszawa.pl/upload/file/luwalotunino.pdf In PDF document text
    • http://vinhhangvien.com/upload/files/66688467820.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/bitasif.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/19577606804.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/81090844034.pdfIn PDF document text
    • https://tckontrola.hr/files/zukifodevomedudinanozem.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/25139935285.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/gaxokofujexopobifi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/94944230473.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e2d1c6257---feruratujekes.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/12992002251.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad169dae3---magepafurasamarikos.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/matonuwuzig.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/83956493624.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/xitipavazev.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/kozumuwazadamawo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4802d2b6f---45461014405.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/31380287286.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161106e1dcc350---76288529452.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a55cb5df3---mevifamugofatefalomagati.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d6108fb4---pagobepogedefu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/81a053f0edf672cbe2a3b14c89cc8a53/pimomudop.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xogukibuxepupafixij.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/92925691541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=teknik+pembenihan+ikan+nila+merah+pdfPDF 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10572 bytes
SHA-256: ec34ede587a35b1099726e2cef6ac866f6b4dc949230c12962b03daec48173eb
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 16392 bytes
SHA-256: 7d7a1bc63ce413b0e47b0d023a222cf0ea78cfc01c7c9cd806b832a8d35d7438
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1