Malicious PDF — malware analysis report

Static analysis result for SHA-256 120fcfd0850089fd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 08:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92b82d2aa0d76ae2fc665fa165451509 SHA-1: 52f5339f09e9c503f08343750b4e47da1ea6b37e SHA-256: 120fcfd0850089fdf8284fe7d24d0a064bfb456319c995d2759369a459b16ab4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be phishing or malware distribution through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=tableaux+crois%C3%A9s+dynamiques+excel+2010+pdf PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/90defb4c252b27c3479695c46e9edd20/25890116772.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/56559319234.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/gatenip.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4d745a36---matutigikuxuza.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/spfpil50un6gbc7q7ttb5ev52r/getipevepunijilate.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c9e6f826641c26455bf5062461f73b0a/nupubetije.pdfIn PDF document text
    • https://actor-conseil.com/files/file/85604933396.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r1fmuck69mtgt1kltfpceql3tk/kogigoxaxatipisogawirok.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/65dbe45e39cf2477071294da8ed516b3/tajirijabejogej.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/daspdjuk7i4pk6ij7pqp4s7ka0/xutupabaganegimilata.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/2217540008.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zoxesomawigakatix.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gokuvonumix.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/fijemosipapujeg.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b91e0306b34---lewixagoturubuwat.pdfIn PDF document text
    • https://synersys.fr/contenu/file/rasomowawiwu.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/wadurobesukazedaxe.pdfIn PDF document text
    • http://kasargod.net/uploads/file/wedoze.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/juranutelev.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af239898ec3---32061097437.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qqic5hi0u08nsqk77tmbirufm4/82507363951.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a3c5335e0b3a02db6aa3afb23f5606c0/8919128218.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/53890973701.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/25701351996.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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 11696 bytes
SHA-256: 8419ff1568169b97f5d2cc80dc71e42a48a6cda37cce99ebe6b85a10901026cf
font_02_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 19220 bytes
SHA-256: 81ececcb3b83c9c4e113059b73134752c8d0bb000b3abbd0af6de52ab16771ad