Malicious PDF — malware analysis report

Static analysis result for SHA-256 204146687635a5ae…

MALICIOUS

PDF

136.0 KB Created: 2021-09-16 20:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2f8aae041114fe907636354855ebc73 SHA-1: c39fe47695707dd597d68af56d95b9dd8048ec0e SHA-256: 204146687635a5ae98c1db04d646509ebd3812d05a62d6fa345bff8e102f2f9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. The presence of embedded JavaScript suggests it may be used to facilitate these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shethof.ch/cgi-bin/dynamisch/file/65531637484.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/xupamanavuzuvoxofisov.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/51542212377.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/93270747010.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/70876158378.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/zumelozatiza.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/28607216774.pdfIn PDF document text
    • http://origo.ws/userfiles/file/fekejowawekaxe.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/56423184019.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5118549524.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/12456900531.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/50724928978.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/rupupejejavako.pdfIn PDF document text
    • http://4darchitecture.org/img/all/zisebew.pdfIn PDF document text
    • http://sjhtractor.com/d/files/93031054196.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/xogakebata.pdfIn PDF document text
    • http://dgjst.com/upfile/file/92989199351.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/65198927042.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17b67aa61---xulabikopazowitebarul.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfa477318---34604454493.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161423be3dc6b3---muzevijad.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134232a021bb---84775132861.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccf7b4397---71605603753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lego+jurassic+world+custom+dinosaur+dna+codes+androidPDF 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_off0001a1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A1 10984 bytes
SHA-256: 13a4c6e6911709b5204f806f8f0fc72bc144f6e557dc4237757ebd26bf0d4a9c
font_01_sfnt_off0001baee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAEE 24380 bytes
SHA-256: c1c254659b4971d9943a22cfd6cb543962c536ac80f386aead65749cd5379ff7
font_02_sfnt_off0001f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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