Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b514e2c8e60d6ee…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 03:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f62aa1e34902cbb02e8cf8004a1147c7 SHA-1: 743caa17566d873afc44b204a5721a7e390c76db SHA-256: 9b514e2c8e60d6ee56176f468a261488e44c56c36fbf5cc7e6e8ebb9c69ccdff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The primary function appears to be acting as a link farm to distribute traffic to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://fiscalonline.eu/app/webroot/files/userfiles/files/86834800963.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608381e72728e---22027641140.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/40276341137.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/73609207656.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/44814103603.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/fobulerufazure.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/monumexutezedifugidogul.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/42995f8754fa470e764fe237a0eaece1/3882645505.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/fonajesijunumasigawa.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/woparabowaxumasip.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160988fcd0c9c8---84368075640.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/tivibesizimomufubafiw.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5396178---69830861202.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69818d371---34157888427.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/34513106057.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf8358ccb---20520552157.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/tuwivanogimawuluxerore.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f5e0e89682dcbf5b578641ec2d2f5b4f/bibefugeratesef.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b452fe4e90---56419806486.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074495c4940e---15081984801.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80e3c9b40735b1cd0dfe979bef269b2c/filivubafikajevozax.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0a2d6794ab4cb79326259c7ce9c77cd8/mimevewapipiwap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=would+you+rather+science+questionsPDF 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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 10820 bytes
SHA-256: 5bce19e59c06d19d8ee288c8d8d8b5782eec6288522a730f8b7c028ce89be547
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 17140 bytes
SHA-256: 8588a28e09835d8321e2679b8dd79599e9c6f6ea47d4f4719e91818682ac667b

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