Malicious PDF — malware analysis report

Static analysis result for SHA-256 b270a83d868871f7…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 10:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b4eb3fc03970fef735650e907faf32d SHA-1: 4d4fa798c1e4fb98a3c81100c1a14dccd60fe1fa SHA-256: b270a83d868871f7a0a5cb8e63304eab39e6499facf18b0fa5a02091e783bcde
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, with one URL specifically mentioning 'gta v android app download' as a lure. The document's structure and the presence of numerous external links suggest it is designed to redirect users to potentially malicious sites for downloading unwanted software or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e1f169457---2280194790.pdf In PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/julilas.pdfIn PDF document text
    • http://moretonassets.net/userfiles/93584003448.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/632576864.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/22a71e0533b3940a0ddde0c31ad47c13/bagegunupo.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/nelatusolezipo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7eb143754fa03083c7c015c73371c679/85840216865.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/22722021144.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/44184684979.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/44243388115.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f51cfa62---96809005323.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/pevedibugonutiwalis.pdfIn PDF document text
    • http://idroter.org/userfiles/files/81717798798.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/lapix.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/pizimevojusewexevolu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a80da8c174dc77ceea223c8679e2a1db/lawijevupoxefobibo.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/72483262263.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/sinubatego.pdfIn PDF document text
    • http://nprofit.hk/userfiles/bebijisufesubuxejoxolu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161433601e9ff5---xowixevurepe.pdfIn PDF document text
    • http://aromata.ru/upload/files/74444103895.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/68342871354.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/33796377751.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/55696750574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+v+android+app+downloadPDF 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_off0000c47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47D 10276 bytes
SHA-256: b1c11cdcb783748773d65435ffe6d82719a5d381e528e7a1bf4f0dd1833a0c84
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17448 bytes
SHA-256: a2b4c55a99bb649d00d66432f3a6531318c1921307f46f43fd7209dedfb1b0f1
font_02_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1