Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d9e5ba6e0c3987…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 13:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 051ddbddbeb97a1e8fdae5aad74e294e SHA-1: 49d5cbe2003db7d8232c7ef0cd0605fd62a69f0a SHA-256: 13d9e5ba6e0c3987d5f7db115ffd2c755a680069122d823059176921edaef6ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=pokemon+3ds+randomizer+rom PDF link annotation
    • https://avphunter.ro/ckfinder/userfiles/files/10889629582.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/80107325153.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/199cabb954598911263bd7670ff3cb52/tadal.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/pivasaraweduxafojonax.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/mujafewoximoderadopib.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210911160516.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/nuxunulolitanatelusevu.pdfIn PDF document text
    • https://emenu.hu/editor_up/30951165636.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/37223002746.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/dobopoj.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24592147081.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/dudalojero.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4160798df---78614226583.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4b5c0ce0---71032136495.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109082126143157.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/dezejug.pdfIn PDF document text
    • http://apart1day.ru/file/wakidabifisaxa.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/9528a616950a2da06a75ae321b99eaec.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/favaku.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/91646621253.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/wirosizilareliwawevazu.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/21116349472.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/gekixu.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/jusinetewekis.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_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 18732 bytes
SHA-256: f23333c9a14ec2a25ea9f042d144d2a127a3071732d184db66df570e9061ff37
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 10588 bytes
SHA-256: ede0c1f301871ae842d6994247ae5ae127705c67218afa478e8f698bde4eb29e
font_02_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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