Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a6c4334fa79ac8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 09:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 957b86ebab6aa8cc0b5225e51bf6609d SHA-1: a6a504bf2dc0bf96533dc897cb01149916c8b620 SHA-256: 15a6c4334fa79ac8261e15f7c968d25dfeb1fffff96d510c6b8efcc992b5b28b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of link farms and the high risk score suggest a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://archism.ru/uplcv?utm_term=shield+tv+vs+chromecast PDF link annotation
    • http://suliaok.com/v15/Upload/file/20219102052236319.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nefovoruzarogovu.pdfIn PDF document text
    • https://membermimpi.com/contents/files/53561745526.pdfIn PDF document text
    • http://japhina.com/upload/file/robatowovu.pdfIn PDF document text
    • http://happy-land.hu/editor_up/ramodavirufipupubavu.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/pubiwowobevujikovo.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/tewunupatewusemapixadusun.pdfIn PDF document text
    • http://rurisnet.org/images/file/88621864718.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/sarowiritamuz.pdfIn PDF document text
    • http://air-con.ru/upload/files/27317801133.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/daputizidej.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5792acec---77701776623.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109051546203278.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3670eee6---xogolotibejiwoxotunarum.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/40607784967.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/78450688124.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f4bc0a426fd85598e8b93069a3ac2683/lonidagumajojaso.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/30510856130.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/gopamedosipikividi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/90080475668.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d683aa1e76---53764674343.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/gijiba.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/tasopigaforu.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/fadiraxukesenuvedadoxabak.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/37518941902.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/gutelagutipusad.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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 10672 bytes
SHA-256: 8f04c871798e7afc426aea9825955e0af67cba7712fc94974cf977d1ca11206d
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 20656 bytes
SHA-256: 0e8c0963b71c40b0301cb7f0ad883507c3940b0d4385d7ae8284eb350f318359

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