Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a41e6331d7fbce…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 14:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5862f15f56d7cb234303af3185b013d4 SHA-1: b0bc3b7aa08a37bd633cbc5c4dc9bd7d1e02d6c1 SHA-256: 13a41e6331d7fbce3295bbf90a620cc97e2b226f802518d9ea8fb84b5128688b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, exploiting user trust in document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://sparkpro.lv/content/file/xitevezefakuterujiv.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1508a6bb2ebcefde07e85ba5d905bc7f/zavufesugibunagaji.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/pizonujifavukapibikak.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2q4di2g553jbjlpif2kdpim50c/94310387833.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e749ab10ab---90034889523.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v9gj8npmkc6jscrhi7jqbseq6b/gakexovefexadu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/df9f7d2bc7197098577104db3c350794/19958369082.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e1d2df9e---gusufer.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/68151109647.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608339277ebc0---laboromivowitan.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477817c5cc---20987790623.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e595f9d88c---44760941847.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-5/20210505060245460430.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f5445052de13899760ec173d844c212e/19637789330.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/mowarijuze.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/fagowusovivosasawofuze.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609671e7d9e18---sarudasekozolumigita.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098fcb7cf0a0---wimepiruxulevemixodo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f0b55056---berejokawifovav.pdfIn PDF document text
    • http://axwelindia.com/uploads/25808481345.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/vujopetip.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2cf07d065---jedepibesarakusinipuku.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8f1a535ed6ec4f405522eb06dd27c65d/tudujugixoralofejeja.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/914f5866a97645f1dbe52127c7eb619b/gawon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=non+living+things+in+rainforestPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 17840 bytes
SHA-256: c82635adc84b7ddfb8ec3955bffdaaab9726a870c60d965878eec4c17915ca22
font_01_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 10536 bytes
SHA-256: 14e12d16b6b6aa2693c08c7f62f66cb1c9b2f90aa60a98d6e5c1198a561bc3a7
font_02_sfnt_off00014011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1