Malicious PDF — malware analysis report

Static analysis result for SHA-256 710b3e988984999d…

MALICIOUS

PDF

77.0 KB Created: 2021-06-20 19:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5836bbddbb8bf6d85f126e236b2a9897 SHA-1: 3ee45d20037b12eed5ec2c6ca89f5ded0548f441 SHA-256: 710b3e988984999d967bba5f0cabba60883af6e92d67f70405bd9e6fa21eac8e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised WordPress sites, likely to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to trick users into downloading or accessing malicious files, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee49316306---dutamazebivori.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6bb389c6---lujapesagifawoxub.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nqs0vcnal49nhonev9p1dtrfq7/gaxebipapadupugasajox.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe15451fc---37949714436.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b3304fc381070f50c1cc68c238d4a1f6/80619627879.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/hsnr4mep6phaiqr4m7huvtq2o3/88210713508.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/eb0a7c110e970c53170f6a4d842acace/zimezabesitemidoveredugo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/febegibosekenoruk.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tasovatex.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/476d4b7ba4e85c2a4962ff1f93364729/91423380266.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160733bf385a3e---segoru.pdfIn PDF document text
    • https://chptravel.ir/data/file/92296814630.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d106d64f46---satadosasutubatek.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/nusonawupiw.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f165f723a9---pijiwuzabirazazepudumofax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=assamese+gk+question+answerPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5244 bytes
SHA-256: 0f94a6fddbe3242c33da44975bd83e2bc6f96c1707df54e1f9ef99cd9382a3b0
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 11052 bytes
SHA-256: 50c00efa591595b053058a59a0c5f0e99bac9b3c580bf2975c4171b1c1bb2d4c