Malicious PDF — malware analysis report

Static analysis result for SHA-256 f087eb083074033b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 07:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c19011c7cebcec805462cbb2ce2e21c9 SHA-1: 9d2ccc1e3c5c81688f5f22ad74da856206b09981 SHA-256: f087eb083074033b9c5f815c3611b5f200400977bce3486920d05b6adda95780
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infotechloyalty.com/bot/ckfinder/uf/files/10257289043.pdf In PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/76587394769.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/84284873887.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/suzasaporugobama.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sitezen.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/gazet.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/43787613505.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/samilivafotukodasebukopu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/37379802600.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kudumovuditepaso.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0d909e6d---kisivigoxipo.pdfIn PDF document text
    • http://newo.ru/files/files/mojenisagetowusirugoge.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/27864014978.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/73682638901.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pisulozetiwerizux.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/23710687076.pdfIn PDF document text
    • http://mosjob.ru/images/file/ririkupagodalizovo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b721c6bc82353f51992bd2799370e503/xegejupudeniwakaxifofu.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/towenitosozo.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/gegegewamuruperetewiki.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nigodutipetemejemesa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203e637569---wiruwuxizanasugod.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/20211360876.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/58770910720.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138821b8bf6c---36766956132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+do+you+need+to+make+a+name+tag+in+minecraftPDF 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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 11008 bytes
SHA-256: 4764935bcf0bfcaf5b7c9f7246e6e076543cc5009ca1afa54531e1320e31f125
font_02_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 18848 bytes
SHA-256: eb62ba7cdbc9df82eb52cdab502bc75529d5fee2f0e15fb6c2f6c0a53fd73275

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