Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6703533ee2c6e50…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 12:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf3e3ae760ca62a29d83b95090283759 SHA-1: 548f983183d861b2a30f50fd84a70c402598ec18 SHA-256: d6703533ee2c6e502dc4e55eb8802281113990ed197708aa90712c701290e62e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to obscure the true destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://jyotiacademicpress.org/uploads/file/wopuzujuluwofodemonadone.pdf In PDF document text
    • http://gyorszol.hu/userfiles/file/zusuwekegumorusosazivu.pdfIn PDF document text
    • http://spc1962reunion.com/clients/c/c5/c535eb5d361035e84cedf1152ec4da8f/File/63418970253.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608233276dae8---28554109050.pdfIn PDF document text
    • http://zae.me/datafiles/file/92347425911.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2484d684d8f7aa67d9a3b26c49f8c3a6/8992074126.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/zuvajenawuj.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/zorofaje.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210706235753_5ztxic.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/gizokatibile.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ff2462ddde20890fcc5bb461f2fb2718/87153697058.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/wevozixepikawovogele.pdfIn PDF document text
    • http://clickvay.com/upload/files/dugogabalireboz.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7e6ec563b7bdf1f83df394055b2388cf/forexowog.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/15233582421.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/xisikibebakenavokan.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/miwefawugirotuja.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/dawuwafotiti.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/15092745941.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c144f1e8d64---dasixejujenota.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608476b7ed724---gevivoxo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc384b9c1---4478497693.pdfIn PDF document text
    • http://evola.it/userfiles/files/31930461725.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/34206682515.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7j6oubcltoft28gnvoni7n7ds1/zeninabinakukijitudoko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9608ad4c1---51589197384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=etiology+of+oral+cancer+pdfPDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16636 bytes
SHA-256: 256c3f0642b5310db96dc82428734ce43778219b999d007692ab5db0e4341004
font_01_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10724 bytes
SHA-256: a3ba84ad96f4d21a273ae747cca03e743e139ed96c11e89261266049516f7317
font_02_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1