Malicious PDF — malware analysis report

Static analysis result for SHA-256 543c347cc35b9fb0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 11:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e492222b5cfaffd4201a9dae3259336 SHA-1: 4ed4e6386bb860805cd164ff1ffe2ac6172681b7 SHA-256: 543c347cc35b9fb0ee7056ef33dcf3791b89c4e7d3d0e814d43b823de93d2e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dok-vo.ru/userfiles/file/tumijevoboges.pdf In PDF document text
    • https://receptabc.hu/images_banner/files/vebugenesadu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6c2f13f1---fureji.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/varuditubomilezav.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc7578c32---tagutedibirurezalow.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b03c1a39ef2a6da654d9fc7c4296bef/85360098201.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/toviburifizi.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/14099159686.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/78449850139.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdfcd293c---75037693075.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/28701122916.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ffb85fd51fb50072964d606c7f35fda7/37974779218.pdfIn PDF document text
    • https://etadelloro.it/images/file/73401832558.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/74339803526.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/70805358746.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/52311396571.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de49e70c1---renimorotafex.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8d9c80ec0---femavuwijowoxo.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/2915008119.pdfIn PDF document text
    • https://gilbertems.com/videos/file/bidixepu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/luwisudolimifamixej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ver+online+manuale+d%27amore+1PDF 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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10296 bytes
SHA-256: 18246a8110d90f893a349fa248228f8c97f37aa9011e4d39b82e8b2d99384581
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 19240 bytes
SHA-256: bb587a71f2c95dd90c3d335adfaebc6ba317cab499cfb5d384d5c830575e4ca8
font_02_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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