Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc8ac9f528bf9b9…

MALICIOUS

PDF

75.4 KB Created: 2021-10-20 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a094d767931d752a6b967f6aef166faa SHA-1: eddb9c1e8eabd1f29ac892fc1a77ca93d7c7d29a SHA-256: 7dc8ac9f528bf9b9beb722ec62bfcd31c5aa3a9bce92cea16a64eb5ad5770e3b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation or tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eptesteplelek.com/uploads/file/wukajedasedu.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vegalofena.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/43905606753.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/1320103528.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/67196588196.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9234c2d90---rubodenoved.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/22885375472.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20211009_A918F6EDF71BFECA.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/dumolinilapad.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/22810993116.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/94926022382.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2oq8gjk0kie9qaluha1n9igtv3/vumom.pdfIn PDF document text
    • https://labelmarket.pl/data/file/panobizapadezapuwux.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/2731100098.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614bef8c6613f---99772179965.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/43047730359.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613460cba77a2---dukofajixud.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/54242079582.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-10-13/20211013173435894585.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/81063347973.pdfIn PDF document text
    • http://moristas.com/userfiles/files/51220628044.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/fajakeliwamamevajezelavib.pdfIn PDF document text
    • http://atya.eu/files/file/60754103216.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/pomojirakaditati.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/91655170046.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=excel+data+entry+form+examples+vbaPDF 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_off0000c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 17176 bytes
SHA-256: 7248af9c879e6abf3df768408738d1afc25f3777c970f4f17cddaf52ada429cc
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 11096 bytes
SHA-256: 92bdd3e55fdd1d6b05eca972fc0f3c42cfec0ead3d3b7bbef86b6a3cc230a748