Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd3725e8215aacd…

MALICIOUS

PDF

92.5 KB Created: 2021-07-02 11:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52a50c58d7caadcfcb68f4fa3d09f0c2 SHA-1: b22afd7ec0266f2cf70673cd0ff40b374d627766 SHA-256: 8fd3725e8215aacd46b4167b343536fbb083f3ff9e19c5d2a1f9325824f67883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/075707cc56b8b5a34af756d228962aa2/62483217342.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/41e01f94633a4e41afdcc82a7351764b/manovamibeniniditagifofak.pdf
    • http://bobas24.pl/Upload/file/pifiluwaxofazat.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/4478096879.pdf
    • http://liburnia.pl/userfiles/file/remuti.pdf
    • https://okinawa4d.com/contents//files/sipijuzulewu.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b81eac42e87---31846954664.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a060386a1f1---lalokanafilalelo.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/33352182835.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lqmv3729110seof518eu12mmqo/jawoxafu.pdf
    • http://ampletrekking.com/userfiles/file/gazepenugamowobezase.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a01c87eb3---66720067931.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096af782f7fc---25575505467.pdf
    • http://mosvag.ru/img/lib/file/9868151980.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/05e06d64627f24111fad78006be65f17/rivukoxis.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d59f2d168---39405807028.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5e5a776cc142e739278e73b7f48bfb64/koxewiril.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890cc80189c---pifegerewi.pdf
    • http://lukinserv.hu/file/42121937112.pdf
    • https://aimara-bg.com/userfiles/file/najugujaxozafojaxevagab.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c1ff549467b0681e4d7cfba6d5ae372f/tiwoxulomon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+answer+the+job+interview
    • 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_off000107ef.bin
e7032f3cd9211ea64169d1f444fb95394d014eee5cfa73e1f182123ea22dfff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10572 bytes
font_01_sfnt_off00011ffd.bin
44060cfd2301ccc8088f83c9a1080a22e2439928979187fb915741d1b54a8b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 17316 bytes
font_02_sfnt_off00014cf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF4 16792 bytes