Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3e645805807430…

MALICIOUS

PDF

115.0 KB Created: 2021-08-01 06:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdb403458a3839ac1bae02405b139ddc SHA-1: 31f2f03a12df4ce7fbb21fa6afcee6339427e787 SHA-256: 8c3e645805807430d013cb125e77ab33b87033535b9614bfb14199ff0c42b8b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure victims to potentially phishing or malware-distributing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crysiq.ru/uplcv?utm_term=50+shades+of+grey+song+lyrics+love+me+like+you+do PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160982f7faeaab---fadaxobedasegugixesef.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xalela.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/086290072bec69c40a695b2689d93bf9/zidiguserakujaxuwutaz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cf5458a84---7520032877.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160943363c0b4a---girerorod.pdfIn PDF document text
    • https://beaszemin.com/files/83871753056.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qdrj3l0a70tngupjo4hgpeitio/98035186540.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078009d929e8---funajitazexak.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9d1191e6a4359356ad61caf46cadda4f/82870963494.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e96a2d461---83705145453.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2d528d4b---zijumew.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/666ba8d792b01301c980bc93f0860917/68687851803.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748ce143edb---tixeratimu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4248d1ed2---80803844850.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/87406642612.pdfIn PDF document text
    • http://ozari-ua.com/files/file/gapiled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c4f77bdc---xexixogakatutanu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2b3a9215620fce0ffd2ea59e61f0c4b8/21905827147.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4ea6a0a2---xarerotomivojuxidix.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/21889799203.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tifopigulujigute.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/9eb7c5e2be24ec069f975a94ee750adb/97044967766.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b9faf143d7aebe1f2cc2bb63c1548436/kobarelazetowoxativa.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_off00015843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15843 20180 bytes
SHA-256: 297234f3c423370f494f9612d3b71a8acc0ba12a3c600f4d86e70cbcfc9237bf
font_01_sfnt_off00018ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E0 11356 bytes
SHA-256: bf35f498870c499e83b160defb98d82c6b17c8b83827707f76c92e018dad58c8

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