Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43ea40c168839fd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 10:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1bed16bf32f37666019bce5fd39e1b74 SHA-1: 4540ca0a8944a00ab6bbb1ebf1d16ea2a03b1995 SHA-256: d43ea40c168839fd61da30ccfcc2cc33490e7c1c5455ded32252a851a301a55a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=things+to+do+in+downtown+des+moines PDF link annotation
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/85498546314.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4483c66f---15648831383.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dksvhl6e15i0ug379geaj3dpf4/zagofusemozim.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/78045935783.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/45740601153.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/rosatunenol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35baea36c---begajiwosawipuwaximijudif.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/mulugubalukivozigavalomu.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-19/efea0cc46a9f1531959a35dbcab8e203.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol5dh2l65jr70sutufqs0dket6/xuvibasalivazivujobedore.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5b0485d2---16164408903.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/74992971399.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/65836413917.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ihepg747vmgkvhi3s0bi5ihsn0/rogonuduxowa.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/doxerejegikeza.pdfIn PDF document text
    • http://azizolace.cz/images/file/mesunere.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/85274866159.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b64b3p306f9ib69t9kb111qiv1/sabagitudopugig.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/gefabeterexewifapijub.pdfIn PDF document text
    • http://netflor.pl/upload/File/73925728938.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/41332528228.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/jujunu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f46d6664c---21795484309.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/tenub.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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 17836 bytes
SHA-256: b291a12c3144f2c2237f4b88f9b5058daf53d9d65eab904f0a610fb7bd7dc571
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 10436 bytes
SHA-256: f76e50dfad12d310e12af202e9399bccef2c620300ca1558f3b7f1e30a286f48
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1