Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dedefe8d3466831…

MALICIOUS

PDF

92.5 KB Created: 2021-07-08 04:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63746c1f8c11c6ec687836f9f4a3bb88 SHA-1: c1937a358aefb8d241f211eca90470fd0aef7ead SHA-256: 8dedefe8d3466831189e1433db96e38e03e7e39420d19bb7c4faa07a8e7207de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/um1rjv09s7sab7un6hpsmouhh7/bipatudedenokubax.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0563kqf5ai62lg5el2s7jeuq04/59819463984.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b3f3ecc0441a2945fe5f439da33a6442/votesemalunusojoxod.pdf
    • http://binhchuachay.info/Images_upload/files/dezetewarozawegine.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57735994d5---57611329776.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c3b64736307d578a1cbea7b7097d1bed/dovakigoraloxoru.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fa5f3af9f62c8535bf855dcb6d3cabc8/68893616627.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be1ecda2788---bufepalakik.pdf
    • http://sushibelovo.ru/files/29455385852.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2f2fa86e222ce2dc81bfc0597f28bd9a/vaforulugotulabojog.pdf
    • https://mimpi1pusat.com/contents//files/wefutobor.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/pp8r7knpl6nf68aepq11kso5b2/sivowunino.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/t4v0pcju2vi5n0ph94ce4sbdn1/99234495214.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0778fbaa0c5497c3defabba05c4802bc/zixerewibesisij.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/banelak.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aa0d89ddf---sitetalebuk.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/44429982752.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6893c126---46001949968.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f0788aa3---kabekefukawudo.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608433e79f76d---13101001852.pdf
    • https://navliecky.net/userfiles/file/gufezaj.pdf
    • http://ohmamakitchen.com/uploads/files/86381118010.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160917fc1b4c34---98482392776.pdf
    • https://ntwbearing.com/UserFiles/File/kuzodoxevezodinuwewupeve.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+frequency+of+a+wave+is+the+reciprocal+of+its
    • 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_off000100d1.bin
83419141087d35d55ee9348589c7b05166aee7ff924d777017aa1a131e097497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 17972 bytes
font_01_sfnt_off0001307e.bin
4ccba5673b8933091e65fca184485da4a1e56f93da144cf351cd9b34a7aa53b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 11052 bytes
font_02_sfnt_off00014a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4A 16792 bytes

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