Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b9bf06073c0440…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 18:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4a37cd4e9801696ac9acb2ae897cc494 SHA-1: a05eadb1b05ccada6327f0b0de081ba0ec375548 SHA-256: c1b9bf06073c044001cb9f9e9bf54b04d808e592634fbe180b42908eb932de21
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16dd2b030---46464104005.pdf In PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/91005369832.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5a77cc13a4362a3ed8f6ac40df98bf06/40909593330.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ospe36pqt47kj0729tojnvuv5/muvikuxotonekoxupirulu.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/20006864300.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ggdiaao008m2ep1bh6atb81qke/zovinolezotegiwefof.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/00be846032d83737e19a547457742e57/99107735095.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791bf2a28d2---6203140627.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/gusifuvimuluzokonujat.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7886b723---kabovuzavikomezefadu.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/71175978998.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/12831756247.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mpppfo4qqnoe6ac536ah1hevah/zisazomosivevotapurufopo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/88v1dcnc7fttafv84f31hdh972/rupuzesivukenuxa.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f1bd92e9---telapetekidotunana.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/41171330154.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2371d492---dasamomipexub.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5e6glo1ioqi5h00ednbtm5aaro/xemanadiju.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922291cce85---3186642582.pdfIn PDF document text
    • http://prosquash.by/data/4234916054.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/74126952488.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/susodabejut.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/damirarafaterigagux.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/43101736015.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/duvapalafanopeto.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/96acc2ff5e565ff8153e15bca263a7ae/bimitalagena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=common+mobile+breakpointsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 10676 bytes
SHA-256: 70db7319b7993e76b5bff990bceb2ec1a179decd4180265c75173957534e2102
font_02_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 17448 bytes
SHA-256: f01ba35dda3439672aa0ecff1b75eeefe1b5f4539f73a396960d6b103c0df2a2