Malicious PDF — malware analysis report

Static analysis result for SHA-256 38922096ade20adf…

MALICIOUS

PDF

94.5 KB Created: 2021-09-14 10:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5280507462292174ea1daccdb7c4d2f8 SHA-1: 188161b9982fd99ee8130ca25ede16794220b7c6 SHA-256: 38922096ade20adf28a9852d7f743725cb363a0c9d6c917105dd0aafd24db140
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, including one pointing to a compromised WordPress upload, and others that appear to be part of a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links strongly suggests an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=fast+and+furious+9+4k+full+movie PDF link annotation
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cf78be6b188b2a1a3756a82bd689557/43584856504.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/82466429782.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zazewakekeremibosunarexud.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4dc8482a---73528078465.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906124725_fgjrei.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/19120341386.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/76599623152.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gifatip.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rokokekamavojixavaso.pdfIn PDF document text
    • http://servmed.net/userfiles/file/7149115277.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/gabedamanodizusoguwodesiw.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/92400423447.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/sezamazepef.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xowukuxero.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ed212ad1a952e37d5ff952cf80c75fd/bizuxolodefazugiwe.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/92355934879.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/zabofoxawowiwenitos.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7d9eef9c---96115142124.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/39588582062.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kunatufejaniwuwume.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/funutizut.pdfIn PDF document text
    • 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_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 20080 bytes
SHA-256: 0762b2fc899291843215c98a443e6ff76016929ddc632ea4e635c59f15599271
font_01_sfnt_off00013aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15302 10996 bytes
SHA-256: 7e8517788197b97c911dc86a5e443ab0e591dcc6bed6b989cacf2b43a1d40e49