Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a98edc461cd3fec…

MALICIOUS

PDF

136.1 KB Created: 2021-08-17 04:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16d2d65cb3424a0929b9ea573cd4612c SHA-1: c6349d6f700b5fba8d65b91f6fefbdd2eb3b438a SHA-256: 7a98edc461cd3fec8a40ab961a20163f1cff1964dfe1a802e78e1416465c0052
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=probability+and+statistics+for+engineers+and+scientists+8th+edition+solution+manual PDF link annotation
    • http://xedaptheduc.net/app/webroot/uploads/files/rurigofepefoxodugem.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/277eaf1db67a0be920f16daf33228db6/kofogewufuguves.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sejaga.pdfIn PDF document text
    • https://tpk-m.ru/files/file/risesitibu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/77287270750.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719d995cfba---30808385700.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/84856430736.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c866b0dfa---sopofowuzavexorutikejeso.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/radivaja.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c241a1bd69d2d27ec782c4aadef27590/dolifewoworugikof.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/nojatidikofe.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/gozalu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/kegibimejinebixopu.pdfIn PDF document text
    • http://tipiland.net/upload/file/85868504167.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfc51d3f2---19716786946.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210613_E221DAA2A7E0E891.pdfIn PDF document text
    • https://bak.vn/upload/files/duwazepoxirazidipow.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/rososamanoxavisu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tajemajabin.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210706093848.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/72949636766.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_off0001ae05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE05 11488 bytes
SHA-256: 70a1d4fadf275b1962c8e43842162039fcf99dc33e87916fffd4d4223e8df3c6
font_01_sfnt_off0001c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0EB 17760 bytes
SHA-256: e46e29d19c12a1257e642058da689e37df828c750321a7ce30b6600591b61a88