Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc48ad54c98692ab…

MALICIOUS

PDF

87.3 KB Created: 2021-09-11 23:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7968d46843bfc6a2e07b68e69bce9b6a SHA-1: 9d68e1b895db8f0a91a8ed61a43c57f036476f02 SHA-256: fc48ad54c98692abe91f69eb70d445c69dd02c85ba1c59f3f48749987e2238bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pistant.ru/uplcv?utm_term=oxford+modern+english+grammar+pdf+free+download PDF link annotation
    • http://jiji.pgo.tw/pic/uploads/files/17764169516.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/rojogiminapobanuro.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///83190514128.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/bewubogobiwowudodibadiki.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911072951663598633.pdfIn PDF document text
    • https://podimercrm.com/img/files/nopenuxaxitedisiliraw.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/71420252057.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/74781661816.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/43803551352.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/liwumawifigivugojufokuk.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/murozutap.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/98f3276719a640ac48b7cc612e4452be/33269003548.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/63009421718.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a90d63d8---60459252149.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibibagunuluzutumegaluwaj.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/55799368638.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dojuzuwawurobumedovimovu.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/gosagatesaxatugix.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wijizerib.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613661b715d9b---kipubefosetodejetevukusiw.pdfIn PDF document text
    • http://savemaxint.com/files/file/56119463674.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7062ba43a---55612480372.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9302c3d1---85556053597.pdfIn 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://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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 11060 bytes
SHA-256: 870ca53f357a576fd7517970d2803f175b93d93a5db5fd20a5519ee3da270041
font_02_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 21540 bytes
SHA-256: 6636563fce4264a79c68774cd3b4dd1974a2cadf73b294ce95f809fc251b9e31

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