Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7af4de0d4d663…

MALICIOUS

PDF

152.7 KB Created: 2021-08-22 07:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa303dc5df337c2668b4c60a9cfe540a SHA-1: 37dd7098a648a10b32df0fb0f0a8d890c9593fcf SHA-256: 5af7af4de0d4d663f754295214174141eaf5e6148d93ae87c2604fa737177dc9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de956938e---24223181267.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878a6fd45a6---muzemudovonezuze.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0480801---90969317624.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/fujoxorupo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c37e532d2---gigidolekorunizafoni.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c2bf3f0fdafa4dd1f472783c2e22ec5d/26277501473.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/770a9591f2ee34121a709be57ea07956/kadur.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/woduko.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/79406933345.pdfIn PDF document text
    • http://ustunongel.com/image/files/vafid.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0491c6cacea787d7a1b2d3787d7f151b/81670262728.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zabipasizividumikulolowu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/74042110547.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/49386066776.pdfIn PDF document text
    • https://maisonforville.be/documents/file/teseteromakoxoxinopiji.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076335c581a3---54020127405.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/8514427011.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/tazikavipukasudovuxuwi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q4fe6kiun6lbr3hsv86m32fn11/rotafop.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/396e383db5bce56b2cc361964f3a7689/94476261116.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e46086f07e80241dec88227ec2af471/vexotozenemirifunukol.pdfIn PDF document text
    • http://come2menorca.com/images/file/57604224982.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/zozatejazarasil.pdfIn PDF document text
    • http://www.heksan.com.pl/file/24880878682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+secrets+of+freemasonry+elijah+muhammad+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_off0001f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1F4 18232 bytes
SHA-256: 8fbe2e6474886313effaea25e14628a5a4e0874eb2defe6d17eca6ecca133a53
font_01_sfnt_off00022198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22198 11192 bytes
SHA-256: 14c26b3850df2d1f35542182ef51880fc267780394c7b1327ea4d106c82895af
font_02_sfnt_off00023b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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