Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cca494b99d8ae5c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 10:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17586b1e978fe2edfe8edf9a8ac0dbea SHA-1: 14761c2a3196f2a3550e76993a9bcf88ed6cab28 SHA-256: 2cca494b99d8ae5ca1e41c8e2b94d7bd790af46d32e116342ee0fb22876cf074
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://laborke.ru/uplcv?utm_term=como+ver+el+imei+de+mi+android
    • http://kqcme.yiaiwang.com.cn/upload/files/98035157054.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6cecd8fafe1efe8b4c9613f51b50bd54/kodaxowemobexagugeli.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/zapupaz.pdf
    • http://open.ua/uploads/ckeditor/files/5545636146.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0a4115d0b00edd5acb4bcfeda839e2b6/27827959718.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zovezoxosuladaduwuzev.pdf
    • http://electric-kernbichler.at/tisuxulolazidorelejafawuz.pdf
    • http://www.miyadenthai.com/image/upload/File/56755910595.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/jabelavabupiruxudorusebi.pdf
    • http://kwong-cheong.com/userfiles/tiwegasiwetonejaz.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161353c3a81f21---13685961236.pdf
    • http://spprp.pl/userfiles/file/89463097999.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/punef.pdf
    • http://pension-erlkoenig.de/img/editor/file/wokanusafarifolujekowabep.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/30040066668.pdf
    • http://konberdbio.com/upload/files/jikox.pdf
    • https://cet.sk/res/file/nobemutuwabawetowapemu.pdf
    • http://domainecomps.com/documents/files/25439062814.pdf
    • http://al-bandak.com/userfiles/file/8159830022.pdf
    • https://irantruck.ir/data/file/21513591990.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/8751317295.pdf
    • http://thietbiotoviet.com/Images_upload/files/roxagagubugiminamosema.pdf
    • http://casadiriposomarsala.it/userfiles/files/73230534288.pdf
    • 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_off0000e70a.bin
be7d495ff38b27cbcbf21600d12c54ad94718b012c6a7ed140cb0e6e69290a29
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10240 bytes
font_01_sfnt_off0000fdf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 16792 bytes
font_02_sfnt_off00011607.bin
f756162fdd7335b612784902617b3b81bf471cf1c28cdd3769f0d7a7bb900b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 18452 bytes