Malicious PDF — malware analysis report

Static analysis result for SHA-256 43314d2100ebb267…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 10:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4212ecc8af2705a141f50a2928d7137 SHA-1: fa4bf584e26fa204ccbfbde66fe55f19fe7a6271 SHA-256: 43314d2100ebb267e233db4569b377c2f05109f4c2cc1281e42259d5c237f4fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a ClickFix social engineering attack by instructing the user to execute commands. The PDF contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were directly extracted, the nature of the attack and the presence of external links indicate a likely attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://fereshtegan.net/basefile/fereshtegannet/files/zevedave.pdf
    • http://ddgasul.com/userfiles/file/33374600035.pdf
    • https://angkaganjil.com/contents/files/runodituxodi.pdf
    • http://macautemple.com/userfiles/file/sepekogo.pdf
    • https://mokhalasati.com/userfiles/files/wiwamiposadexaxomuje.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ed384697---sivasopoxepoduno.pdf
    • https://mahae.hu/files/files/xovetajetutipilexajiweri.pdf
    • https://wigs4less.net/nbloom/fckuploads/file/93090165190.pdf
    • https://juraganmonyet.com/contents/files/35242393013.pdf
    • http://www.polni.si/Images/files/jalijakapekodivodalajiwaf.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bdbfd1db1041cd637db0489f8aec0782/pisowasevovi.pdf
    • http://mobilenmr.com/files/files/kudunusagizowep.pdf
    • http://psychologadamczak.pl/userfiles/file/zoxenaxevezewupeve.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/44343503687.pdf
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bosaxosuziferiduweturito.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeca4eadf---31278964852.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/69360561463.pdf
    • https://globalmediaminds.com/uploads/files/deripiwalov.pdf
    • http://kaupa.cz/userfiles/file/gemimifolusuzubupuv.pdf
    • https://smartstone.ca/userfiles/files/lagitudibo.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139536b5422a---23178526629.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfcc47b5---54036977789.pdf
    • https://marathonroller.com/userfiles/files/2190010975.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+uninstall+android+studio+in+windows+10
    • 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_off0000d6bc.bin
0151c84119a20766c7ffe16cb9c2953b12658ee409919c5695677d0d23e8f3d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 17248 bytes
font_01_sfnt_off00010310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
font_02_sfnt_off00011b27.bin
159b3a3fec496b97d03bb7de7b554e935f047162fa13ef24affa03c72b58ea24
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 10460 bytes