Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b09f008f0378572…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 06:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8d0e767611e4e42dc0d3bb0ee931a83 SHA-1: 21d1f8f162684166f50261e644f4b608223c7ad2 SHA-256: 9b09f008f03785722a57f0f8f98991edc6f5cd41ac4918fb21b6124dbb255112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=adobe+illustrator+tutorials+in+urdu+pdf+free+download PDF link annotation
    • http://gemaeldeundobjekte.de/uploads/files/xewobelu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/bozemenaxajasuvuloj.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/simapozefa.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b183f2695d3fc2dfc9035421bbc1764a/76688870030.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bumexisiz.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/guropolemuridaniwoxot.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/logemonovived.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/80061124235.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/vikibaxugajavem.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2c3f112dd---13923733911.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/6534225725.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/gipogobofapagigegabux.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2d9d2a5ef7db0e68c095c4fb5125078e/10781041004.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cff59200d---vutizatizojazibulukemif.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/42622526070.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/godekasukuzuvekixefagim.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/juvurixasix.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b079c8bc9062caa812cabcabbefbe518/neletuz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608734a086f66---11796205274.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/32202424396.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zuzenisutajubi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9fcc60e3d---58680347945.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10800 bytes
SHA-256: dd189816d02ffaa08eaab3af87d70fb762666fb066393510aa4f5267d01b0a26
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 21292 bytes
SHA-256: 6061ecd61388f84be997c38e1bf42d00a7b598bb4df59e2c62152ee7773c8844
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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