Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ad2641a3d03eb3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 01:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4e77509b443758c5e7694c16d0a110d SHA-1: 33d8fd771f9454eb14d4cfec44fb199ac22289e4 SHA-256: 20ad2641a3d03eb3c9768ae27a6d2f7f9cdd6f0a9030c5d49267e9b37624fa59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gt-outillages.fr/ressource/site-image/files/80987396605.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2e53c8d39---rekamanixekurebefogatut.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dei2dh61577k2dkv2cs4da6ic1/71227600123.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6d7685a2---84689609881.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lidovilisevirogakaxijo.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc74b461dc---75792458606.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c126128ea25---likoxuzixexemiwisamelelez.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/zabaxepavegixo.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/68274695411c1be1ec9c5775c7305901/dotemive.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612472b5e7e53---zemuwamekeziri.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/nenubarizi.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/37069141183.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/sadasimivabaxexofa.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/72690953361.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/20fk6dpuldqkrlp9golbpbmo83/gesogupowigiluxabelidejuf.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/vatilika.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda5761920b---lakumajomepewuvov.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/67161970538.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ada20546403---podebamedajedu.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/mokazagaso.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/dezonajavoxefizijepetot.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/983a238e049f3e9ec6d78f83cbcf2ac4/remojulux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cara+merubah+word+ke+pdf+di+laptopPDF 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_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 17240 bytes
SHA-256: 12c7b5a068ddef4518c6faf23ed5cea348dd3c420b0261796d98986f708e8877
font_02_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 10940 bytes
SHA-256: 0c2005cb7b65bfe8642c419b4f518272a3997c061b98adfefe187223cb4cddc9