Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a0b895c6c6440e…

MALICIOUS

PDF

101.6 KB Created: 2021-07-17 14:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 686ea60ea195ce0085e7c2be4164cfad SHA-1: 76a64eca71f2fca2cc56ab602a87f9b20397d8ce SHA-256: 27a0b895c6c6440e3d7b66683185a1db657d21617297d896aeaa6f469028375a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, forming a link farm likely designed to obscure the final malicious destination. The presence of embedded URLs and the PDF structure suggest it's intended to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9b02e4de---sejazijomijefuxawegobasom.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be1fea3e4---sekusi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s98h5q6nmp7mhc8vdskfgvj2h6/ramifumukudavewele.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/rewokubizaza.pdfIn PDF document text
    • http://houselandia.ru/files/galina.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/m9m9d95cjjivj014kqtpjhdhv0/66613092355.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c0d13b071f989c6611646bf37f5c72c1/59895963199.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/29161782519.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b10340a86a9---84707789075.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/72774500810.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/68651631547.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac933d3ac28---wufetelobimakivapina.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c623e4347---99742899875.pdfIn PDF document text
    • https://tappowine.com/file/92848020545.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a5e7028f8c52cbe8efd8c2011c00b044/furulida.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/534204a0f122e2bb0ec4dfa2f7b88444/38880096912.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/md56k94agbr562pjtcqaublc50/57451889893.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/57592208501.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0389045a3---30764926332.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/183237de70ce56ac2ccee1a8043603b1/bugigijalovo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c40c4ace94a---75154316398.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe1edc508470cfbd527363075cdef44b/73630551701.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/85768502398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+dream+league+game+2020PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 17780 bytes
SHA-256: f942844fcb3a33a05ef4a04bf04fa75910440610c36d5041b521be7bc25d4c75
font_02_sfnt_off0001519e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519E 10664 bytes
SHA-256: 5c7b32940cd389edf1a5619bca0967e2dc5aa8f489883acf82d7ea0e305c6e97
font_03_sfnt_off000169e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E7 18944 bytes
SHA-256: 821ba8d70eddff2158f398e67b187dd285ad129b8c9597949a7a8d8fd9bb8d23