Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea77d58eee33fe73…

MALICIOUS

PDF

66.1 KB Created: 2021-06-10 05:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: df3788fa90aa878d4d4d0a1296752976 SHA-1: a424834d43ef6c6d8360bea5f5809a03691f1ac1 SHA-256: ea77d58eee33fe73ba6b86dbba0a89b9dc510c5ae34e0eae22f6a93e972042f9
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The document body contains garbled text and metadata related to 'wkhtmltopdf', suggesting it was likely generated programmatically to host these links. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://irlanc.ru/uplcv?utm_term=boboiboy+boboiboy+movie PDF link annotation
    • http://ducthoaudio.com/upload/files/38839424357.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/55150022099.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/fujojuviladikelajoxitip.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b706735a---barekumepabozovulipobif.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97b93310e---62809935716.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/babuwojurisetolawolimep.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7cd2db1f5814631017fc3bd22f2aea6d/67441063319.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d589787be30c2fa4900e6e9d07bde3c5/93745655714.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954bc070fc---vikijugifunaxolapuvu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/79e37e8514709bf0e3f968caa7866069/97536689277.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/543056a239d8a501f2c92c8dc367ebdb/91061665330.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab96e76883---41023600467.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d98f1942d---99344702624.pdfIn PDF document text
    • http://bakoca.hu/files/file/posetuzisuvadakane.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b388beb5a---37633714387.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089c73973640---pojepos.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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 4668 bytes
SHA-256: cce005598f52aae4987115d1a4596fc7c09e6abbb3ab31624d9f5a2b1e768d27
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 9712 bytes
SHA-256: dc8d412488f44cd5fb47fe8c808dfecc3857890ff7839c9cdf2d1fe119b075ff

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