Malicious PDF — malware analysis report

Static analysis result for SHA-256 866bb6987272d01c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 05:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd756c19a3b50d1000bb52b9ca63023f SHA-1: d7fb1987d69d7f328061b931a54543f2a9d740ab SHA-256: 866bb6987272d01cc344ae9614085d9801df0ead968affafa05e5c3c30f00078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gialtour.it/themes/userfiles//files/koxijazobagedobixovadi.pdf In PDF document text
    • https://rkdestate.com/userfiles/file/fosizawulareketiseviduf.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/kowufidixapanadap.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/waboxolepurexizeler.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/62894936602.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092e3f83cf65---71681808178.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zepalatiwixibejije.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/31024673987.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/rorobomiwuvunujujuref.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f59505b9ec38603298359525fe6d51f/merazasugafeguwoxeju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612af0ffc128e---40059634171.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/5fvdpvtk3jsqtodlmudjbshc9d/gexifezobari.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/gemezitedixutigoferaxisab.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/vibizinufogusolul.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed395c4be---90562852090.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb32cd9550d3659cbb3b89868ec01957/5124061612.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fe332eb50de---xorazifewemededisi.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/60520119064.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/76059614693.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/43142143311.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9f84cb2e6bf7223d651813509f894834/nusokejeniga.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d495bb2b336---88730941079.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/nubidiladuxugalavumuw.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/44882814111.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/us7kgjtk6uuph74mmgjr3ru22b/dovumaxazenifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+download+juz+amma+dan+terjemahan+pdfPDF 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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 19564 bytes
SHA-256: 69a5eb2a0dc76bff4d2d3908849c556d26ec48934c42458bf5a4c47e37cfa7e6
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 10856 bytes
SHA-256: 6ce89159c2ab2d21a8193e644c2b566ba1e0357418e38d2382dc40750fc3a0cf