Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea364e2a394f67c9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 03:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adc57b685f0b07d315a18589b71301d5 SHA-1: 5640365e0ca5e9c61f5e64fa0ed814f4c29ac187 SHA-256: ea364e2a394f67c95c204675bcb4d8285e727f0cafac0176adb3b32a4906a817
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.kowel.com/ckfinder/userfiles/files/1630963762.pdf In PDF document text
    • http://tdbm.vn/upload/files/bodobukurilenete.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/86233477396.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/36429578104.pdfIn PDF document text
    • http://texmet.pl/userimages/file/solep.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/714f497c3eb64afe56318b950eb8ce48/boginuno.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/92616143213.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/611c7c9bd58ef4e68981d347acf14526/89284260482.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/11704998263.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/88545004259.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/46964005377.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359cf491cc8---4576309795.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/80310965429.pdfIn PDF document text
    • https://flomogroup.com/upload/files/jajezofefo.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/90118844982.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/11030286254.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/nidipon.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/lixixotowudutivam.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/68511093048.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/dejan.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/zuvubipiluxij.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/94729223825.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/webefade.pdfIn PDF document text
    • https://greenways.at/userfiles/file/zajimakidagofawowamimew.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/mimabilojukudegiforuzo.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/69332994489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=my+hero+season+5+english+dub+release+datePDF 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_off0000ce32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 11008 bytes
SHA-256: 9fee06c9e706c5f8442a8a031cb7f9cff0da914632b9453408cd33cd75436d26
font_02_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 20472 bytes
SHA-256: 08c700bd7d653cfdcf178fc1c02708484eacdb5fce4f14295a77f017ce982ca2