Malicious PDF — malware analysis report

Static analysis result for SHA-256 a286a8ae07874793…

MALICIOUS

PDF

97.6 KB Created: 2021-08-15 08:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b2d41461b7828ea09f8f4608ddbd068 SHA-1: 5a06c4dde400f06e22fdccd9dcee14c61952af14 SHA-256: a286a8ae0787479335a9db963d42b71e19eeb5ca75905366baad253c20ded627
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://myphambambi.com/webroot/img/files/waroduregojiraxulifajiv.pdf
    • http://riskhedgetech.com/uploaded/file/37794951260d19e151021e.pdf
    • https://syteq-pro.com/userfiles/file/bupuraruporedab.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca203de59f---51236609438.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15df5724d0---morinego.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/81723276466.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b1f1625df48acc5a8d1c04f4a22a650e/15310384763.pdf
    • http://akvatoria.by/UserFiles/files/90833871419.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/megoxasedapukiraramiwofub.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15e8bfa81---12205399961.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/zokituzarukefidalax.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ed7e8a70c55eecf1edf0050a7b3a43a9/90059365198.pdf
    • http://bright-inter.com/file_media/file_image/file/merimid.pdf
    • http://ccforum.kr/uploads/file/1623489805.pdf
    • https://badoza.net/userfiles/file/dugewiwakexevijaxigaja.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/dbhnfd1333l0s3jg4l0mi1vs8c/51721917793.pdf
    • http://nhs1980alumni.com/clients/878257/File/8510308980.pdf
    • https://nestsearch.in/admin/uploads/file/81167626289.pdf
    • https://okazionche.com/files/90673724439.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/fekafadusazijakisudaj.pdf
    • https://ever-progress.com/upload/files/13144135039.pdf
    • http://etpatatietpatata.com/userfiles/files/48097497579.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aceite+de+oregano+para+k+sirve
    • 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_off000114d3.bin
a6a512976368888b93ab554d52ae72b1711b25bc408d28ca051a97186c2123d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 19012 bytes
font_01_sfnt_off00014501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14501 16792 bytes
font_02_sfnt_off00015d18.bin
792cb12bb33f9151dc6469be41bcdd14c7b8347eeaa524ff345b0d1487471b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D18 10780 bytes