Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cdfe9c14535426…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 11:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d832497b94271e8116a4d3a4a743751 SHA-1: 40bcba65708ad5a3338658539fa8a61afce9c48e SHA-256: 36cdfe9c145354267cc4d4497a1b3c68504b8a74c9034971e872818e8f314aec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8665

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 https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc3f8ea424---delewulenomopuruv.pdf In PDF document text
    • http://lucann.com/Upload/file/rasuzo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/dee553efb59bb5e4544522665448f0f3/zawimiwafek.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acfea3e169a---lapivag.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/45986173293.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/petelamuruwegizapo.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/81914129650.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ead0d7813b---lilosasurekezoxoja.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rikanukudutowabos.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081090bb391d---63420726881.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6441f22e8---52568252520.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/e937rck7oigc11hs2b8ur99s5g/boziritujalusomiduguz.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/90423792461.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/07835d022207c3e91cf9b9cd3d0e4dc8/57838878065.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8322c2f21---jalewo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/32458238111.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace79629b20---lilajiwejebiwudinikugu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/me2lemdje607f0p8escdli60fe/sipivaxikivevomad.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8514de3f---1695778974.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pdr9pkvm6uu10ptkp6mruuut57/kamajeriwoxukuporotu.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/vemomudebejadu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7d74216b38b900fac594b58c654dad11/fafutedisisefajipemo.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d391c245d---bikojuvadisiwix.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/16810313818.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/20962756299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+start+screen+recording+in+iphonePDF link annotation
    • 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_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16960 bytes
SHA-256: 998d6ccea84df0f3d4b8e9e827948bb08130d9e73658abf9870a392585d06cf0
font_01_sfnt_off00013964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001517b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517B 10824 bytes
SHA-256: 592f6b5be335228b8d3d471efd4ec7ea1d433cf2d91206baa69b9a91a6deffdc

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