Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d3abff840081fa…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 15:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0197ec75448248cbac4ea65c8e4c1516 SHA-1: 10a585a6edd381aeea84608473335016ce040154 SHA-256: 13d3abff840081fa27a6a7a4ac8aed4e56a06bf39022683d90ccd85fa63b4d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted from this sample, but the presence of multiple external URIs and the link farm heuristic strongly suggest a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615847cdcc38d---7485733742.pdf In PDF document text
    • http://ahnil.com/userData/board/file/kewokikopuku.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/45188117360.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91120494602.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464d62ab1dd---pabuluwudo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/gebizaxakewetuvumobeli.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/34629526554.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/xiwen.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/mopad.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/namoromolidagom.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210919050004904.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/bevodusinivabubovatodag.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613406533f028---vogetozis.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vevuvob.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/38258841006.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/76167774673.pdfIn PDF document text
    • https://tekmaker.com/upload/files/38209174281.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161403104a7422---43324279040.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87052454987.pdfIn PDF document text
    • http://eric-parnes.com/ckfinder/userfiles/files/jupatob.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e559cf975---24722929443.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/65700334406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+you+eat+canned+corned+beef+rawPDF 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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 17460 bytes
SHA-256: b6c6c4a6ec2846a25892c280177407dd3559d5b6a6b9b575b939e4a1ab7709d1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10636 bytes
SHA-256: 528674811250a8dbc5e75053a68f77bd40fca4ae496e0ae6a3785e716300796c
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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