Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e4cf414c1d9517…

MALICIOUS

PDF

145.1 KB Created: 2021-07-02 04:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22444b997616c984e6d99abe081cc248 SHA-1: 6c1f7da674bda7f6cdb0dac47f5596714d37d558 SHA-256: 88e4cf414c1d951790cd4efa45fb82235218605142514bf87e7a7aac7ec48487
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to distribute further malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607206f59bc93---vagunezasijixobaxezuta.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/7202908984.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/fewogefopuliwizibafudojuf.pdf
    • https://alutat.com/data/file/3344358357.pdf
    • http://standdominica.org/files/files/81868840667.pdf
    • http://www.sport-konyv.hu/userfiles/file/27584384361.pdf
    • https://camping-du-lac-dijon.com/fichiers/xedonifizosogudi.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/salilovubirikujemot.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s6000llbon9gv92rgsou5t3526/vevepugusobakunirinaje.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d38cd30c3---fivewuv.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608537de2f474---67807962437.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8mba4occ95sci2d90pqh6u4s7l/69106074767.pdf
    • http://www.mustwalge.ee/data/content/files/48182667699.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/56c4ea66d8f06f43dcfe55993ca9eacc/sabisizap.pdf
    • https://soccerauquebec.com/userfiles/file/37233260221.pdf
    • http://sportschoolindex.nl/images/uploads/zegomiguz.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/87573261fca2a573483982cd14e133ed/10793023175.pdf
    • http://yuhenganquan.com/userfiles/file/20210615184428_1673222452.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc32fd8c84---51677831485.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609619157483e---kiganorawise.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/t1pr9l22khpeap7q9q3g79f5a5/66812576345.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d049116ec6f---pisotoririsex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ielts+book+10+test+2+reading+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d3cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3CF 16792 bytes
font_01_sfnt_off0001ebe1.bin
b4b9f66c4d57226633184eea6e3b1d8516f90d35da7be63fcbc08375720345b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBE1 18604 bytes
font_02_sfnt_off00021d4f.bin
b7b0e643650358ece586136a65fdcb66fdf07c1f26eb4827eda4f886559e0140
pdf-font-stream PDF embedded font (sfnt) at offset 0x21D4F 10988 bytes