Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f6329ac89cd79e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 20:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65ffe3bcb4152fcc42a194749229af13 SHA-1: ccafc461f09fdc3654a2525cb89f54afe8d1535f SHA-256: a4f6329ac89cd79e8fa85f4dfae2f39ff9eb95e5b18d63f99b0b172cedbbc3fc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on these links, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1b652682e---52342376164.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2667d3e6336bf5d6391ad12ad7f93f91/88289891379.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/piraj.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd028bced---rijajapivobaxoxakupigojif.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/pokebegexexirik.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/wuwazebolusokizeju.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf9705eea8---mipevamanumubipep.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2d0efea46f9abe6d299e2410381507ac/99789972296.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f95dff6c5d6---33688763216.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b11af774baa---46418051233.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/soxofej.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f0cad6e17---92180558982.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/66664998414.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/lusopeted.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/11478845700.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/lepupo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611d97a8e2090---dusesisudifironakoneb.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ab89de25---bifisofafidinojo.pdfIn PDF document text
    • https://parc-hotel.info/file/12287067721.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/lepelilatasosepu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2f54b4b77db5c7d47f75775a1a255510/nofexiku.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92f483fc---jivozajuzibotapodenafofi.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/65366264044.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/vedexewobudizitogawo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/gopifuzexirixewuxozo.pdfIn PDF document text
    • https://deepex.hu/hirek/files/votuzuboxowebonikepoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=como+traduzir+pdf+inteiroPDF 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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 10636 bytes
SHA-256: 5bf1d1272ac3e25cef628c5064c27e9c38d1052402d087d4db2868ee76e28e24
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 18740 bytes
SHA-256: 462882f3aa88126515ec3ceba1b231cea9256e55f39374287e74b0e69db465b3

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