Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7875d5c992c8285…

MALICIOUS

PDF

82.4 KB Created: 2021-06-26 21:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35e5847639f91aad81e1aa42c5463e5e SHA-1: a36aa5d854068aa7c8674163d8ff8e9af1f76995 SHA-256: e7875d5c992c8285284fb9090067f619c96a55bee4e008a74daba80970016b6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute traffic or potentially lead users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, supporting its classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.hgbehringer.de/img/files/files/30242036806.pdf In PDF document text
    • http://tlxzkj.com/uploads/file/150523275107.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/73a6137495d196aebdc1c80d53caa388/gufowa.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/radifaxenugi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b516b5f2a63---pavuxozokoropura.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/df8ieju2dkghdlqvo9in8gebt7/kuwanipokajusubila.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/76117915852.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076a335be687---kosoxiwinot.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078076dbeab3---49968936631.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/b9faunjtu524qbuacqu4rbbv56/xewakasokur.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/46386551294.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f9f1dea85487049aa4a202ccdb356ebb/15931017804.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608872ca1ed09---wukiforepiwajositepitovi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbbd93f7a---mejusinago.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/nusojega.pdfIn PDF document text
    • https://service-panev.com/userfiles/dokajomibibifir.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e72f0b6d---78770173204.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/21192083261.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ff6a9b9c95432689652a36055af6b141/10020349078.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160840c4ae0f4a---labalebasi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/makefureworinivikudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+add+column+in+pivot+tablePDF 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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 17356 bytes
SHA-256: 7096b504887402947891dd3f465718f8533573cc9664c620ee6becc50e5ebb75
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 10792 bytes
SHA-256: 2ad782efec2d107418a2ac5022f208cc6864fc2f3dac23b042928f09efe4ddcc
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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