Malicious PDF — malware analysis report

Static analysis result for SHA-256 20731c9389f6dac1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 21:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42c7695bbc373e2365fb9b56e1522b48 SHA-1: 3290c87719cad7f894eeda4b82c639d5b89ab9d9 SHA-256: 20731c9389f6dac1d6bda212c7eb9826b01acbb536c8a64c903d5f6895b0405c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1792c68a---23518170172.pdf In PDF document text
    • http://precisao.org/files/files/semusalaretekevafov.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/xelaxugewal.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/biralafigojavo.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/87931743012.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdf760679---xitunizivojunijusuj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161397d8b490e2---tamizijapoxaximoterosi.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/23952534962.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/5222442188.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/86070677145.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/15693868838.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/41288462104.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e31edb06---76012233843.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/nofovifofawabipoxo.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zukizufanoperazarotug.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/83423839052.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/47701240693.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/mumariluvuf.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/80676276031.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/13695266927.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/22390457264.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/jupawabe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ccb0ce9d---52319272758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=shy+dial+app+for+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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10388 bytes
SHA-256: cc211675a683c7faf1248062493a7441360298fec15dd03423a1f00307d33505
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 18060 bytes
SHA-256: ad9dcb61aac1e1cbc0f85819c216cd116478bfc48baa10a16c6fb4c9e8021a29

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