Malicious PDF — malware analysis report

Static analysis result for SHA-256 799100be7002e64d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 00:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 631fc19084f6c6d85301ce34c2ad1985 SHA-1: a06936dd2dc1439a03877032de574aac88513d02 SHA-256: 799100be7002e64d70360757975d978c0b4307bfc0f4e11b0369a4a24c84119e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=redmi+note+9s+latest+miui+update PDF link annotation
    • http://keralatravelpath.com/uploads/file/99311200703.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/75198273615.pdfIn PDF document text
    • https://jetaime-shop.com/files/dovotamipilog.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/68409997660.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/pilebafefemelorokogo.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/lasekoz.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613866aa637d4---virelovezutejujixivogu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4cc9472b0db5a1f1aed76ee0bb75a9df/26109506735.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210916185132.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fku739ndvr61aeif10oouq9env/27111614729.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/zukovevanomizugaz.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210916_a6727.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/90265543603.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/wevaziz.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/sotefegenaxaneg.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ef47c75129b299bc0b8873ad8cf4e997/lidotewufep.pdfIn PDF document text
    • http://geoman.cz/data/file/11536636668.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/25789238435.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903202421.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/xalilibizib.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/fovudu.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/zipupabovijivefiginit.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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 17548 bytes
SHA-256: 5f0f5d44d3e54030d72a86914910622edef3fde2b8a875f4c25d88dd096c5562
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 10768 bytes
SHA-256: 2d24002163fd33197b181ff266b65db1e6371a2af990cfd230c02bb082ab5cac