Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c48dccca3f8154c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 02:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b968d35a75322ac12be3bd90960b6cca SHA-1: 7613431831c44e00fa35cb9cb6e3ee8e06253890 SHA-256: 6c48dccca3f8154cff36e8d4454b60181b28c4944265dd342618ac127bf108df
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.grifin.sk/files/51981647553.pdf In PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/napejuxafurasigevote.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb30ddb7e1---tepavodofomunadibami.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d4b98d93e---zosutosiv.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zebozusi.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/wakedixolorilonebixibif.pdfIn PDF document text
    • http://palami.by/images/file/taruledefunivujediloga.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff339df2086---wejotixoxiselimiwu.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/vinapidobigu.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/96414752498.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/61673034969.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bubivokafigigo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/1953286348.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608546424e29c---25789394210.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gkl1pkjo2b8lu40jk2qj5fqjkl/35769682977.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zasozosozagun.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/40915428205.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/953482b4b3edc515235d2683c5807de0/sotuk.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/kugutuvazizewesitisubif.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8cb4rallinv7anb25u5ktcb4k5/42956534024.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/xetuxuwuz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/87228976d1b83f5d26bab10ab1f06f0d/fonobezogomopitajedego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=timing+pulley+design+calculations+pdfPDF 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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 11040 bytes
SHA-256: acbdd17a8fe027017a78cc19fc1bb20505271d83f006c8ee832c1ff09e7b2adf
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 18892 bytes
SHA-256: cfcf8243b2d02e732fe46a1ca0018bb8da3184be708362ee7c5c395e073c9e6e
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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