Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc45a7001cc75866…

MALICIOUS

PDF

62.3 KB Created: 2021-09-30 18:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 801910332d7177413f52ff3a28bea3bf SHA-1: b802fa1f7b91ac7eccc913b6da77fa1c397049eb SHA-256: cc45a7001cc7586643528418a777c4959ca99c09a4b51d66484b2df611035f7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage disposable hosting for its links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=android+phone+wallpaper+size PDF link annotation
    • http://rmgoals.com/userfiles/files/78166382910.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/27497590801.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fowuwada.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/95065103475.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/60813363671.pdfIn PDF document text
    • https://hotelcorona.ro/files/49445760034.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cd7ce06f0caf79998f641ee3ba43767c/11005469592.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/witofuvus.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f67990c27ad92a676dc73e5e3067a151/27110587265.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/65272059969.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/61327805642.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210919101852.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/51874157428.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/45055249691.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/36028629539.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/80840657591.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77e08db04ae55178736980b9ab2fda2e/zifovovamode.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/39793287463.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/kojewopufizawos.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/7392010126.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/12997519856.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/tolapuzosazowopitix.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/87528685436.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 10520 bytes
SHA-256: c7387299727c6f001f3b06abd2aa6443fd7b4b00e4d59cd7000cb48b53882e4f