Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0e1155612662db…

MALICIOUS

PDF

70.6 KB Created: 2021-08-28 23:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c970944a04f7c7d42f29b33b8299510 SHA-1: 521d6c4209c7499ed76bb5feea1677b185035e6a SHA-256: 9b0e1155612662dbf2206ea88a1e7fab52fed34a9d000a8e4514f76e2791a074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/mudizagawotugazofopenak.pdf In PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/34a3f7b9d4040c75b38ff5fb0dffadc1/49146874032.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mk2r6oue6ve4ern40dr49i2o6h/74917160845.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c9f37127---razofopomirapod.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u867absgb4t11jick96o9ap2br/toxevokekadesazise.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c876ccd204---76125125271.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ggm2qutrh0mjcu7orfmrmpffi0/vetivibupepemebukosaza.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41cd1cd49---gomobexir.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/vinev.pdfIn PDF document text
    • https://ancoraeducacion.com/images/94452634602.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b4c0eacf2c7ac221e047c80f82a14ff7/80959585810.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/44540171606.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/4186846277.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ba467c5dfb68ec2dbc464daf26781a55/zixexalepudaf.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tababivuberuwivozoz.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/wixorikezalexak.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2de92711b---fepil.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c7f9959979bfae9cf1a5e5f9af3b04c5/juwog.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160739f7bb1414---75389184550.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/33247320944.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/46127559606.pdfIn PDF document text
    • https://isleo.com/i_photos/file/tawize.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/64084895100.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3ed1cc27---bogajazipuxito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=goodbye+song+learning+stationPDF 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_off0000b6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FB 10716 bytes
SHA-256: 1bb97e407759e52edb915b099a07dbd64bbad3adce959cd8e3729b050e4b6280
font_01_sfnt_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 14716 bytes
SHA-256: 72a0de65e3cb00b4aa6b9dadeb0e9640be0ddbca583e8fdf93d681eaf919f6ff