Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cd358275596940…

MALICIOUS

PDF

84.8 KB Created: 2021-07-17 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1121d8dd5fda8b8368c61f7790f451f5 SHA-1: 36a20677de959fffbb31acce9550e0fc0c0b0476 SHA-256: 36cd3582755969408cbfd281125d06ef343eb6f1c72893957c372d5c8ef184e3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of numerous links, some using UTM parameters, indicates a potential effort to manipulate search engine results or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb2453f55.pdf In PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/49939707675.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/mokarubeda.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/72105343048.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ennkpmhkr8gdvc7n6f8obdhr2/tanukajat.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/rawadiwozoro.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/82000867616.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sugatasutet.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/11537731458.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/92998596355.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/14678440348.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/c706ef1776d63b69025a2917f4953116/vuzasepuguvejasemu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9b04673bab5c929e76a6790a3dc9a114/50846981162.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/15986605839.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c24402cb795---dipumevuvoko.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/76210180499.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/fegikazunuratopom.pdfIn PDF document text
    • http://sdds.be/userfiles/file/22819230237.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/ridepidolazineti.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/11129834495.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0afe4ac485f8a90a9b80f5b1574f82c4/jomugotuseguzemofe.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/wafinutig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+calculate+molarity+from+mole+fractionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 17752 bytes
SHA-256: 8a9a353ee0422375752565d82414e01bcc326f43637711e7157d1529ec72b3f3
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 10620 bytes
SHA-256: 15748675a174031d4b116b538ae31eb54603c3a143b0dc9aa03fd63ae3b76c22
font_02_sfnt_off00012da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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