Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e85cb68757f098…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 17:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a91db1ab4aaf972d7251ed886bfde4b SHA-1: 24d392415e389eb318b2e4b5ec5db031b9f63ce1 SHA-256: b1e85cb68757f098918a2593a8c9d1106f9953770fff244e4785d23171abba2b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bccphil.paramedix.biz/uploadfiles/file/56096973949.pdf
    • http://luijkzonwering.nl/image/file/xiwawuj.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210919_010A2333B0E95105.pdf
    • http://marquisdecor.com/userfiles/file/jokedadoxixalotanogupus.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/tezizabemirilexisixi.pdf
    • http://stefanourso.com/public/userfiles/file/sadoniminumulibebamidux.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304fbb88a83---54787851709.pdf
    • https://veaodaibrahma.com/uploads/image/files/85869716081.pdf
    • http://dnepropress.net/files/file/fodafefubemejagik.pdf
    • https://kimcert.org/E/file/56426244127.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/6461499228.pdf
    • http://accessiblevehicleservices.com/userfiles/file/40245001944.pdf
    • http://weiken-rc.com/upload/files/82938266530.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8e93ae656fb685cd7dad995378bc3303/jenejop.pdf
    • https://thebookonpersonaltransformation.com/FCKeditor/file/nasilugo.pdf
    • http://www.hydro-tg.pro/upload/file/topugijifatelamegoxowavom.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/bekabas.pdf
    • https://mkontakt.pl/dat/file/pasudelatexejiwuwir.pdf
    • http://cosmikkino.ru/sadm_files/fiwizofowilozeduxu.pdf
    • https://patriciogaete.com/upload/file/35676579870.pdf
    • https://vcubusinesssolutions.com/userfiles/file/72984792386.pdf
    • https://eobliecky.sk/userfiles/file/pisadof.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7cc7ef073fd8f8343198b4e3e54406c8/pibixe.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/73555436879.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=francis+chan+multiply+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 16792 bytes
font_01_sfnt_off0000c7de.bin
138d9b0d43b6f1a1de2b2e6d72e25a317fca70771d951948713c6f0971bed551
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 14332 bytes
font_02_sfnt_off0000eb85.bin
09f0ee4842f97dd95d91db496e0d5fbe034bafdedd9bb2afb176b5fb99fe1faa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 10824 bytes