Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44149dbd0840b24…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 16:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae5c7a6889331f44dc439e28f94e1b3a SHA-1: 56ff219c51f4cab194491c9ebbd5f5e83d557256 SHA-256: f44149dbd0840b24f0dbfc45bd9f71131e9ac8342efda73c7f3d5d371811a24b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure itself strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/bekegamesima.pdf In PDF document text
    • http://brcassociati.com/userfiles/files/wibenokipusenukorijawos.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0e7aa07a08090beb63c231d8ec6e249e/55625433145.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/zabax.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21815884969.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/jojeli.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/famekalozuliroladi.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/wumevunonunejikibagugadu.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/54206969785.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3l010ah9to6bnd4ecklegj0tu1/dorukaxowofibibevekalaxor.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/roxamililuno.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/roviziwe.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/jovat.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b364545f---9386547225.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/meloz.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/lisiwezonudilufifagomofeg.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/91161939664.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/95187170621.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/80254247902.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-19/20210919030030605742.pdfIn PDF document text
    • http://chinazzjx.com/d/files/gimonuwamev.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/26400008667.pdfIn PDF document text
    • https://digiconelectronics.com/media/terogine.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/92667654658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+1.14+60+apk+download+freePDF 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_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 11104 bytes
SHA-256: 6ccfd75d67d69a36a3d58797cabee32d748e0ed829e2a5fa93785f2b4f0a6f31
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 17268 bytes
SHA-256: 7a70b2b2c9877f090b6897063e9da23a70f5e165437233016fa1a35756ef9f3a

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