Malicious PDF — malware analysis report

Static analysis result for SHA-256 052fd7a890782d9b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 18:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 935931b4b8b27b06eb363ce49f708302 SHA-1: 5917c9b1afd183637a6f1145c7819ad941add363 SHA-256: 052fd7a890782d9bede5f99df1a61b7f0f4a39bed4a176aa3bd0e1a2582b9822
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ahkjt.com/upfile/file/tevodit.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd08b6dfd---19597752627.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109221306017601.pdfIn PDF document text
    • https://khanikango.in/file/41134452671.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3vdg9hap8eu44phsp3d8dho61h/70666154432.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4235949f---gemodowijevisejowawe.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jonokes.pdfIn PDF document text
    • http://agilesolutions.in/uploads/nakotirisivesex.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7fb596bf7623a6b17b0af57af2be2072/bezolosipiretivumebelopi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/lixabidarorikisam.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/82082753950.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/venavusokaj.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/duxemosulakabawuxajorijo.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vemago.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba95ec3d0b---9255910879.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/digazogogumotipivuzef.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/birivu.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/zusufazeritoxi.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/34188506990.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/89630478454.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/74352180299.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/79334607548.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vopewivojobilig.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/zusenegodinigizixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=global+wind+patterns+worksheetPDF 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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 14952 bytes
SHA-256: 3a4b3ed3aeecce0dbcf55bce01a9cfcd086d1f9aba15dd75168e9ff12935174f
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10848 bytes
SHA-256: 247b74d13357aed4b1a37ab3df1ba221df0dba80c4eac4ac0761e95d408c51a0