Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a1d9b52f7b5cd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 03:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7136c3bb7e0f241761dc7dce3569967 SHA-1: 29de70b31745b88e82ebee24e8bbf9c4711f083f SHA-256: 359a1d9b52f7b5cd6f7145efeb46f1607488a54da75ac2e87e0ff607bc2ff9ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the embedded URLs are the primary attack vector, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebeede7dfc---45765044080.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ivt1pf55laj62ldbap7ob31fov/21601911109.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3bn70d2cqt5c4093s66jgsmceo/gabasotuzaxolejeruxuse.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/65086415187.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0aff4bcab1a8d55c9276b3f53e15da74/16361412387.pdfIn PDF document text
    • https://mangallagn.com/images/file/15713450308.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7087efcc---tujutimubijofamuwofibare.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/disobefekonigu.pdfIn PDF document text
    • http://moristas.com/userfiles/files/batigokaxitifojamomolus.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///67717421799.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/78516547394.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/delubetidujedusegofedew.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/gunegirikizikofeganozog.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sowofinisiwovede.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dutojebazomibawosil.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/tovanonubujawedefekuko.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/69269428479.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/72140374729.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/50453575268.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/pogomivagamapo.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sozajejobisaworinepa.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/gisamewanujibafa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6d79f4f0e3710cc1faf35b9790cfcaf8/vupapitawogu.pdfIn PDF document text
    • http://choiranterszheng.webblogg.se/2021/march/is-avast-mac-good-for-adware.html#guq=zzIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sword+art+online+war+of+the+underworld+part+2+dubbedPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 20440 bytes
SHA-256: b8b1f72df0e90ae3832f8c84e0a91a0701a53428db36871f6f4fa3353fe35927
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 10948 bytes
SHA-256: 50f5ffc1eea76c913ab8d8a65851ae8bc6746a3398271773ce0f7f9b9e82629c