Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b3a0bdd641536…

MALICIOUS

PDF

87.0 KB Created: 2021-06-23 13:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 75054136856ca191c926f55453903386 SHA-1: 816f45dc18ab0e3786e4caae8a87efcd1509768b SHA-256: 1a5b3a0bdd6415366407d97ccf5f1acc97106fb9f1ef8cd665aa2a300b8cc936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'resource pack', aligning with the heuristic findings of PDF link farms and compromised CMS uploads.

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://huntic.ru/uplcv?utm_term=hypixel+warlords+resource+pack PDF link annotation
    • https://jackyrouxmethode.com/userfiles/file/46754948962.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/98043438330.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/duwozugegazera.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/53mdlle3h52feapoohi2usp4v5/29839594390.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/bogugegiberogatoxonu.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/seripima.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/lezevizaga.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/rivusi.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jovowapugosaxobejewu.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/33432304773.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fj091kvmqqglvom0uv01ec5ukq/22900523526.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nvhcch2hpf8gletvlr6vutq241/suliwanesunumus.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f07ed9fea8---46555254343.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4a1a2fa0d395168aad23c09de78af9ef/wijam.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/24780749020.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae23d279c2---68552322892.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077475bc81a7---44345041610.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_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 5352 bytes
SHA-256: fb04b1ef7f8da1760fa06fbd3234c22b17fe0c421332e76f8c201daa9993e3b9
font_01_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 11300 bytes
SHA-256: 32e42811183225014b877002d9379657b389a79332aec71bb917bf46187e5ee8

Open this report in the interactive analyzer, or submit your own file for analysis.