Malicious PDF — malware analysis report

Static analysis result for SHA-256 8200648ba037c825…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 22:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b4d8c1fdd6b4e70dbf90f57e9e8d08f SHA-1: 16653f6b77f92f6e4f66808732a127f1bcc2c10b SHA-256: 8200648ba037c82556f6ee02965a102565f834e27b25f9dbd2a877d4fbc9e52b
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lpad1lijit8lrq6f6g2911soq0/19301557093.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2fe14a01---vekesolowevosamerutulomop.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1fb928d39e7aa936ef8156614f0ca55c/56543454833.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90e9a0e76---12208894839.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/fa682191be0bfe9e64db4952ac1720c7/58896878642.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/if058mrnvfi3gebb2mscorqpv2/49862472189.pdf
    • http://malagi.pl/user-files/fck/file/dafuxinetimemikidetubawe.pdf
    • http://446888.top/userfiles/file/64257826702.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/03cfe0e46e295d8dccb2c46763b072b1/zutipiwem.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b6259df3---lorojejajesutozokemujuf.pdf
    • http://learningkey.org/userfiles/2368878953.pdf
    • http://ekolojikweb.net/upld/userfiles/file/52179042000.pdf
    • https://mmagame.com/userfiles/file/77308910701.pdf
    • http://mwflower.com/upimagesfile///bumamovuduladawemu.pdf
    • http://marinapogon.pl/upload/file/52067739434.pdf
    • https://alshaabcoop.com/userfiles/file/72757115664.pdf
    • http://kiemtoanhaiphong.vn/upload/files/87209414656.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ek0pgr44m3v1rtr1n0no81u1t2/70033400594.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/iusktps23r79nsgjcut3pd35qh/voledamevoketere.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc31a4c9b7---23602413218.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ee3a0ecd---16178191576.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210617_3B5B7C5997FA26BF.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc82239113---4947456910.pdf
    • http://learningkey.org/userfiles/tisulelizajifutozo.pdf
    • https://abugfreemind.com/userfiles/file/nexozume.pdf
    • http://patroha.hu/file/39159646649.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=time+distance+speed+aptitude+questions
    • 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_off0000eead.bin
9f9d5c824821a868339fc888876e745fb8313dfc15b9a4c541323ce7a4df6cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10740 bytes
font_01_sfnt_off00010720.bin
587c355f32eb4c9d86f647c16abae60a2c91bdae34e8db41d6beb36d699cab7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 17972 bytes
font_02_sfnt_off000136fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 16792 bytes