Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51b04bfea4db168…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 21:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4005f005e14d1851a6fc2fc938fb35e SHA-1: cf84396bde811e8a879835af376d40a253ae856b SHA-256: f51b04bfea4db168ab5099015fc7a5223e44fa711bc1d4cfbe0931d0c82e77ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The presence of these links suggests the document's primary purpose is to redirect users to external, potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=get+date+now+android PDF link annotation
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/taxifitabarew.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tobabenigunigemupud.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/14477130467.pdfIn PDF document text
    • http://biomehl.com/images/content/files/nikosafadijanevazugabolem.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/wovemifutetaxavabasab.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/42337011892.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/peporixusuwadunekaja.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/64949904112.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/42201169256.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vefodenetonowevufizuvom.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/dugeralorigobisud.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/54788770985.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/fikusikanijeful.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/43357893130.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/72786425122.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a0d344e55---deduvo.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/12642216457.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mazisotufosam.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a1700987e---96485128193.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/dukepivajozesalefa.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/baxufofotinejogibeketak.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ae859702---74529080925.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/60570977790.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wovefise.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/62270711850.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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 10152 bytes
SHA-256: 59a25e182ccb461be08322da3d8a55fcabb2b437bf748a5d51d2a2c031411500
font_01_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16648 bytes
SHA-256: d379128ca74ef41bdf88bccfe0dae0762a2f74dea652d8694219068c9d646847

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