Malicious PDF — malware analysis report

Static analysis result for SHA-256 383d26aa19d3f98f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 12:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8b79ed5473112594551761b990a916b SHA-1: 059a10cbc6e3111610c4b6122bb7b7c0cb3a11c2 SHA-256: 383d26aa19d3f98f43cfbf97e7040403e84bdaeb95a3e672f39f3d332f3dc462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be a fake download for 'gta v in android mobile download', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=gta+v+in+android+mobile+download
    • http://erfaspot.com/resimler/files/10866513548.pdf
    • https://www.stnedu.com/ckfinder/upload/files/77074223612.pdf
    • http://studioarchperissinotto.eu/userfiles/files/55493564795.pdf
    • https://cuacuonbentre.com/upload/files/33052510020.pdf
    • http://marikitaberbagi.com/userfiles/file/xegirunojalugopusesox.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/88ddd61f07239d8fd39916e97ecb9c9f/45355060577.pdf
    • https://cortopolis.ar/userfiles/file/71184043025.pdf
    • http://brava-ekb.ru/userfiles/file/beviv.pdf
    • http://njxinbell.com/upload/files/27608698667.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b47dbedc6e---38214618021.pdf
    • http://austria-ex.com/images/blog/file/94318692989.pdf
    • http://homestationrealty.com/userfiles/files/75056903480.pdf
    • http://inkjetartandimage.com/Uploads/file/94235461677.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a356da21---66721997759.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/43318300538.pdf
    • http://beergolfers.com/blog/images/file/donodadofufiwobin.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/zuvurizenulofekil.pdf
    • https://yingzhaoliuart.com/upload/file/42761352342.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9ad4cc8c9---11411180793.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/86827715156.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/88456536936.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/bijojeludagiw.pdf
    • http://around-sicily.net/userfiles/file/17078424941.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b4.bin
bacc653d343cc5223070a1fc3819eecb1b5f78a261b38b464deef01addd7030d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 10572 bytes
font_01_sfnt_off0000c9dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 16792 bytes
font_02_sfnt_off0000e1ee.bin
8146a7a6b1471aca7cf264ce43e6319e60b8ab7e315b6cf9d3be2db9174e4b5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 18540 bytes