Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed46378383f37ab8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 11:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8323273e84e87383539201075aec1e0 SHA-1: 318e1f8b9f12680c4c2b12bc5f39f7f62229ba14 SHA-256: ed46378383f37ab8231e93cb73df89df10da707a5fe19563d9a6fb075ffaacb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=how+to+cast+mobile+phone+to+tv PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e191e5b16---30959027076.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/bozujegi.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/piduritodu.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/9477078028.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/nexezopazeriwigadawuloni.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/ruwefoforujerowizep.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a5hn50pjbod5kugkdbokjoitv1/fiwofoxegibuvati.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/xorirotola.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/16909903475.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/gikegifutad.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/fifizekidafazekux.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jepenitekuforumib.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/336522eea79bd390427fe3aea5ae6683/72379355018.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a3759623---53302835607.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/menoroletu.pdfIn PDF document text
    • https://electroagro.es/pub/files/68207256455.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/falunujeji.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/57004068510.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/jukemupesejabas.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/12661575774.pdfIn PDF document text
    • https://zzwgjx.com/d/files/27348166711.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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 18096 bytes
SHA-256: 77e537fb0c779e3a8815ad35c5a1043beca1785c12e74f7c0b481daafd00e3b8
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 10824 bytes
SHA-256: bdb8c5f1c8b6542aeaa1ae8ad0adc61249e40c1bff76b36c05e0d6e2c47cfb58