Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf9de955e82b936…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 03:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8276cf296ab415ddfb004074d3334a5 SHA-1: db8cb5ce91c7c1ae0f53bba7d7af63892e759a5c SHA-256: fbf9de955e82b936e428b07b05a8420d705a6547839b621d5818d283e2e9269c
196 Risk Score

Malware Insights

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

The file is a PDF document that employs social engineering by luring the user to install a browser extension or update, a common tactic for malware delivery. Several heuristics indicate it functions as a link farm hosted on compromised or disposable domains, likely to obscure the ultimate payload. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b75171ea3---finozivonesekiwolovira.pdf In PDF document text
    • http://problemconsulting.com/img/download/files/mebupemexonekudumezibad.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/bizozi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a36f14465e0027bf80bda33eabeb2bc6/41840116950.pdfIn PDF document text
    • https://luminex.pl/upload/file/bakeze.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/12588517659.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/gatuzotuxifivutezaluzumo.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/20392743652.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/93471554521.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gerezewexalekex.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/tovofagatenilana.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gazidopigopa.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/kivirimisitipiw.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/bozimazuxuxebumeb.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c344e14cb---votatokosowuwazu.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/seguxuti.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/nuvilelod.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/43536216331.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/39124528077.pdfIn PDF document text
    • https://pmms-online.com/assets/file/laniserep.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210908102746.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/fiviv.pdfIn PDF document text
    • http://aquatherm-graz.at/files/69250732497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+firefox+mobile+androidPDF 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_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 17036 bytes
SHA-256: 391c891d13d689bae26a02c3ea1981202ff68e4e5d073301c39b64f628ba6374
font_02_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 10580 bytes
SHA-256: 70f6fd8d68a6de3247ed78e94ee9326c5c19d681cb1b04d89c92e9e62a0540fa

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