Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4e8d06e4a5957c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 14:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59fb38a2dc0909dd539343e6c94ad9e6 SHA-1: 02fdff5534e71e791969711e160b4d415022aadc SHA-256: bc4e8d06e4a5957c6ecdce1a0a756a59de5eff639390fa18dab0d89d12106a20
124 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential distribution point for malicious content or phishing pages. The PDF's structure and the nature of the URLs suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4675

Heuristics 5

  • 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
  • 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://dietaltop.com/userfiles/files/roganizejidixekojanijaluw.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b399300eb45---69307459408.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/400fcbb9071025aec2af465d4df6d3bb/metukamiwuxefositudovokij.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6695f0af12---senerobinoguxa.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/nosakazevazinowoxukutu.pdfIn PDF document text
    • http://hak-al.com/resimler/files/41693636828.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/sikimegopugepatifisejo.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kideminubipijak.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0def20f32df34e50dd87a57cd5ff5d/waviki.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/mikizezuviguwuk.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/wuketikebawamuxowodaba.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/94700582237.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/wupakasajamuvosomezojogew.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gurubuvowinoz.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/lawuzag.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8d06922cde8da0aa04e5d7fbffd2604d/53830365686.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xizul.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/dagewefajanalidena.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b0bf390313a62364ab6b53ea0b8e8a7/15566858976.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/82181261ded6df22522613314b64db00/fifapuxufetijofun.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/13470838137.pdfIn PDF document text
    • http://lu67.com/clients/50962/File/fulokepoxamopakofapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=witcher+web+seriesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 18568 bytes
SHA-256: 30cda083845dd07af681de6550079bc5be1b347a83266dea5990929dacfc2787
font_01_sfnt_off00013acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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