Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdf8379cd0d12a1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 12:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0d6103399765a986888371d350270ca SHA-1: 9b380b9a87bf352851f7cc2bbe078331a18a3cfd SHA-256: 8cdf8379cd0d12a1ae49804ba3810ee45f2869d60d2de4512b8c021594d6383f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of numerous external URIs and the 'link farm' heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://glozor.com/userfiles/file/87602438064.pdf In PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/zamafa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d2dcffe81fc476213a24b7d42382f341/wujakod.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/31644475417.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fgegn1ci1q1ug264agb6hs0vvt/xumuwujatinuripikozubixo.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/60791780562.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/18687849975.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/76055821654.pdfIn PDF document text
    • http://gibisch.com/files/files/24921486621.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471b91f0f9d---79358142407.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210908025849.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cbc0c0f4a62856455eef4f1ca52b92f6/19497983337.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/46895785578.pdfIn PDF document text
    • http://cataga.de/beta/files/file/36361695068.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632300394.pdfIn PDF document text
    • http://vodova51-53.cz/files/dogoduwupufugo.pdfIn PDF document text
    • https://themalc.org/files/file/tobiwogereba.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/83896ecde6821cad7d675c15ddf966df/fowavunevopolijogogawena.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/depexonu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130088adf720---29790040737.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab4a866c4---kebubitajepaxevukami.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/42046593072.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/supifux.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/55707332898.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/kipurelusonesusotimerowur.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/sarokokelozok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ana+e+vitoria+onlinePDF 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 9980 bytes
SHA-256: 98844b981c6b61a4574d120131aaf5448a9b62715e210f3678704b35030df20e
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 19448 bytes
SHA-256: 373a0b045ce258b7da644e8fd4a8d712a13d7e6b7a353d364a2a3793b0948ac8

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