Malicious PDF — malware analysis report

Static analysis result for SHA-256 858994b3e9f22779…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 23:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 823a7230b9057545a47ebf223da55f9f SHA-1: d3a3bb5d61094c60719c705111d3345b212bf3c9 SHA-256: 858994b3e9f22779653ad5cc06d0e5af02fb90ec8a9f1b4257c7107e5e8fee01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b9dcd5e---69488379224.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/voxirilupebogixag.pdf
    • http://cgl.lu/userfiles/files/31824050138.pdf
    • http://ketphatthinh.vn/upload/files/34197075967.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/90a62227f44205a7fcf65cf17280953c/54434058270.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/gitonikewo.pdf
    • https://aljazeerahdrilling.com/userfiles/files/jajefawizunupokarem.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/movunoxi.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845abeef840---rosovad.pdf
    • https://balaji-technology.com/userfiles/file/6135313291.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/faxukuvoxeminulebate.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724b2009435---49811975450.pdf
    • http://envigest.cz/upload/file/54464225520.pdf
    • http://superazs.ru/images/news/file/xorikosekubunugejofala.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607738e8a32dd---lesaxojezivozejimere.pdf
    • https://themalc.org/files/file/74199070823.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m06j79ccrnft335ma32nqhc1ah/galodalixevujiwopunij.pdf
    • https://anmoul.com/userfiles/file/koxeg.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/49862379519.pdf
    • https://goodline.by/userfiles/file/99202607584.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca59ef1b2---kodederukokuzuxagazevun.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/lividexanabutasode.pdf
    • http://medica-brno.com/files/3118073621.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nissan+qashqai+owners+manual+2018+australia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 16792 bytes
font_01_sfnt_off0001009f.bin
f07fdfa4f95ce5b77efdcc691c3ced7837236b3e785a5509a95604189c44f34b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 18420 bytes
font_02_sfnt_off00013096.bin
47a3370a1295652ba5c591a730e9295bb2c2eb75b891e5f8eb5eb48908b16ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 11184 bytes