Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2a9a3c85c1c550…

MALICIOUS

PDF

86.0 KB Created: 2021-06-13 04:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 18a62b36bafe0c4b479e49276c32ed52 SHA-1: 5c26629d10552928ff14ba75372a16db9f24d04d SHA-256: 6a2a9a3c85c1c550a16fa76167d3fbff54100c681280818d74992568edc07892
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to distribute further malware or facilitate phishing attacks. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=vb+net+projects+pdf PDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9micqfpkqh5ek87s1c7r1nhn2r/rolarobavumufetegam.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9ff2566a---lufemujinupo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/kowumuboligizotedo.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/15338719238.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mknb8tf9k7na2qvulho14l0hi2/71455804300.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b0da027f---rajerugololigix.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6135ec595---1079895940.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a062e46783e---86421317360.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d58cf384f5---47564832630.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/23106875845.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/97822675737.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608761a0a7b63---5715480467.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sidap.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/71rgfdrl8i30imf2jq7a3cgdv1/32071139794.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be50720844---67508762866.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ec33d00b---wumebojunekalutefunak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 5088 bytes
SHA-256: b64dab10bb89a01606a7578fb30c7afe4f48d1aad43d649e2741909d37bf9b42
font_01_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 10548 bytes
SHA-256: c0f86c22bfa56c97ee14410ebed0deacaa28aae9d091c51f66b91d8a5b4ae8ac