Malicious PDF — malware analysis report

Static analysis result for SHA-256 2831f8edfc341ae5…

MALICIOUS

PDF

91.1 KB Created: 2021-07-24 05:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ee322b2f6f6cb94c5416fe3e3cfd15c SHA-1: 17bf57f6a0234974e16008b609b22e5ae8efcd4c SHA-256: 2831f8edfc341ae52099a51086b7d08cfbbb4aabb92d98cdecd1d99606aee8b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca2216a67---redewezusufafogikaseguk.pdf In PDF document text
    • http://vodnik48.ru/content/file/59658077738.pdfIn PDF document text
    • https://tepihtrava.rs//files/76022136473.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/020ded914dc374ddc89880bddef866f5/1263407264.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/88067781534.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k87c45o9o8002cfnrtops354fo/nixunaromituwubelekojedu.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/binijudagewi.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/49733123987.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nhqq873fua4946nqd2guckn283/15042559897.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5m7v4ppp1jbjdtuhr9bdrpa9fh/fupisepejad.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/65728376528.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcda7c8fa4---2148703254.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/14324332089.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020ee1285f---65965425150.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zorerekexibexasapakunube.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/butupofudalu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d3b70eb9---91300003881.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/84911660422.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f41e8881dafc50fe124274bebfb7bd/8384641982.pdfIn PDF document text
    • https://immobilgold.com/file/22274979551.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0cfa685e4001054ea8bef9bdce2f1940/gifomomo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/fo49q6nv32jfub2uir1usjjetd/kudamisovewurajitunozu.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/lasidaseziziwinedigefowin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aquarium+fish+images+with+namesPDF 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_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16984 bytes
SHA-256: 9c3474ae575469ebd08b370d58afb678283dbd453e149a0d11d2de391fcfca4c
font_01_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 10808 bytes
SHA-256: b24ded0cb1b3f01c01a7184edc82fb900263bdd5f2cac3d2c73596083d51a073
font_02_sfnt_off00014543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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