Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cdca0ac06a7240…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 06:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de02fdec6f92334e915019c549d615bf SHA-1: 109519bb40c3e8d68b446496236ae416c5790384 SHA-256: a6cdca0ac06a7240e13b01c9ab8aab7d968a6870107ada8c4eae873b34040f13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the presence of external links and the overall heuristic profile points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/suputujexujeludi.pdf In PDF document text
    • https://allora-tour.by/var/upload/file/mefilazexife.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5f9c9a1c8---31587973729.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/54482636839.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/31567300696.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/13217905931.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219141649195851.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210911_C7220963D0932715.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/jafodenaminesuze.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/46956623928.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/dugag.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/92722291509.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338284352cb---pikese.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210914054317.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3b7c6e503---jeburokuvefuzudizita.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/7909748265.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/55059638340.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jupufafod.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/95349312618.pdfIn PDF document text
    • https://e-room.co/userfiles/file/57376276776.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/6676178823.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/49013852591.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/towotuniwisuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spanish+adjectives+that+start+with+kPDF 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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 10896 bytes
SHA-256: 228425310e30324c0364537c8bba9b406c703841ec9abf2fa87b63f12e474bb2
font_01_sfnt_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 15496 bytes
SHA-256: ed298f2dea9e7209b43ae156fead98351a2d6233d089a95a41716e2bc6273e3a

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