Malicious PDF — malware analysis report

Static analysis result for SHA-256 8079245063fbbf73…

MALICIOUS

PDF

90.8 KB Created: 2021-07-18 21:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b69c8bdfa0d3fc708d746df94e79c1c4 SHA-1: 23c8f1bf3da759a2c0794fdd22712c3a6f4792d2 SHA-256: 8079245063fbbf7342998f27d04609ff1ed8091f00a8796079ee7c646c3fe429
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3bb8f7f6831170cb1ba6149ae520d041/53201715926.pdf
    • https://red-adlay.com/upload/files/45546422484.pdf
    • http://sun-green.be/ckfinder/userfiles/files/lelazi.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/biforutumewekixabivuwogi.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5ed67049651cb0736a013366cdfbf372/nijilawa.pdf
    • http://mrpokedb.com/uploads/files/bepabaneba.pdf
    • http://cleangroupbd.com/ck/upload/files/febegefidi.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949557a27a8---4265227676.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087552db9b61---resoziwudor.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1984cda6d---37405401744.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sirukuxizamenorolex.pdf
    • http://obrienbuilders.com/userfiles/file/dapafumo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934ce60203e---13767112241.pdf
    • http://eltonltd.ru/sites/default/files/uploads/95870067832.pdf
    • http://orikon.net/Images_upload/files/21412276169.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b837137a6a2---xexeziwadusavaxo.pdf
    • https://braindevelopmentmaps.org/userfiles/files/besewexalatapemozi.pdf
    • http://thuonghieutoancau.vn/uploads/files/tinib.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba303a7c039---97785663016.pdf
    • http://myapartment.de/web/editor/files/wovufenumuf.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a79580574---41791448479.pdf
    • http://wabasnb.com/files/fckeditor/file/155388751060a65ba1b0c0a.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=7+on+7+football+field+dimensions
    • 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_off0001004b.bin
e24b8380bd11a6f9cae81c5033295ea358d86e7beb0b4da4b04ceb2bd4823eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 17388 bytes
font_01_sfnt_off00012de7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 16792 bytes
font_02_sfnt_off000145fe.bin
07b3fa51b1871c8a983b5b23517502b02caa75fea182731b36a266cd46b14949
pdf-font-stream PDF embedded font (sfnt) at offset 0x145FE 10508 bytes