Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82c53e6c7f2cf40…

MALICIOUS

PDF

100.2 KB Created: 2021-09-16 10:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a05f8a1a539ab3cb661eb3694338bd9 SHA-1: 265bb987b0a10f8e637434b893389315aac5beb4 SHA-256: c82c53e6c7f2cf405a70a00b704f3279ac1055c01f080e89ec2bd60bf676584d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically for displaying a fake CAPTCHA lure. It contains numerous links to external sites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=android+features+list PDF link annotation
    • http://sieuthikhoacaocap.vn/upload/files/31763661381.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17411493032.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/14400401751.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/vemekiniju.pdfIn PDF document text
    • http://rurisnet.org/images/file/guwajopopetipenuwijeza.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/8257227999.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/12687806081.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/29131804118.pdfIn PDF document text
    • https://architektor.ru/uploads/file/wikemosoxarej.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/26321591526.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142c72a5f31f---63524505479.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/turitasakefiwu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/ladebuzepepepusufejuregi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a673503691---zujanix.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388fbd2a064---50629999905.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/8418268738.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kijoj.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/firukavobipopafapetanode.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/nijigiderukama.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/79555092218.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dolufoxilema.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/8907597463.pdfIn PDF document text
    • 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_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 10428 bytes
SHA-256: ca75ecaf7949a364388e62a36242a034e284682e03da2be56e90115469eb8b54
font_02_sfnt_off000155ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FF 17372 bytes
SHA-256: 60a6d89b7b323f6b54df751f82b3337f39fe068b4d0ecafaeac92c8c53d4c75f

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