Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d36b6516df649…

MALICIOUS

PDF

76.0 KB Created: 2021-07-20 00:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e54e1fca9938dee57b813002428399bc SHA-1: 099403207c7a7ddc2a0d99ef8df721f188548625 SHA-256: 612d36b6516df649ad93db057df43155476f684b64842bbcc448ddf92b9be20e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160765107f3e3a---60682235746.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a8a9d48a---63710565674.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fidazefexo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8fdd9c5599232621e4edae38089d08e4/69478194431.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/piwenekinipofubokeba.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/59135032594.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/56821008410.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/mebezujavebepibozaxugom.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8bcc3676bcb7570ff5afe9730f0225f6/14984744291.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafa27277---levej.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/sljc44e401oacub9m82387elni/xekitim.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ddb199911c602c17c03bf72da543ccd2/jesolalokizedipi.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/19499888925.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/65667225036.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7582926b---79703918604.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/30754512529.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/19331829668.pdfIn PDF document text
    • https://bamor.org/userfiles/file/29620405807.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/27b0614187d0eca5b174f91646cf6242/34113492309.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/52574235421.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/1080866354.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/31720878506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=40+in+simplest+formPDF 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_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 16428 bytes
SHA-256: c97fbcb2b8b7ce59b29048e156c7ce32c28a67ad2609929437fe6656c1a29a93
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 10460 bytes
SHA-256: 767a76e9aa7b65c85be5248c1c03b63015d048f575572ff9eceeb8805805da32
font_02_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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