Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e10c2da6109bb5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 00:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e71888352106675dd58bac9ec0dc773e SHA-1: 8396a3022fd3a9f0d8c0d7f80f0d0bcc57fdc1cf SHA-256: e6e10c2da6109bb5ae66481583e5a7bb0685d0f33fa21340f2c35142cf8c8adc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c37a5686eb87f09cfc24c4d30ab2091d/vaziz.pdf In PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/pulikude.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/47666635232.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/16811345354.pdfIn PDF document text
    • http://espokebar.com/uploads/files/julevujarifegi.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/96380352652.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/30157875853.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/ribawavusimarag.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/95802185465.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c24bd697f24---87543878610.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/58f21762babd23435c3a9818923fc2f1/1620925158.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/vibofikategudiwa.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3be1c4adfd1e66d91f9914f1847209bc/rosaziliwotegabodoj.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/13495056353.pdfIn PDF document text
    • http://enricobarraco.com/files/41095239374.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/kisapawuxenoj.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9313920688d817f06928ac6b16e7dbc2/58814855078.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8f87cf68878692e65a95b5c31d80be7c/81401375784.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd5c32b45---votixujiredomorenidugaz.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/93961680583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=quemaduras+por+acido+sulfurico+pdfPDF 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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 10740 bytes
SHA-256: 94bae467952eefe4a1b04c8e41616d2a37598d29a32bb087d721b270e70edf0a
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 15788 bytes
SHA-256: 1919195543c5dfca7eeb3b9d707f58885ee4e1eb1a6da6feec7aaa7e897fa435