Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14735a611907475…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 00:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d065da0eac3ce52aa0d5b91b59e9c9b5 SHA-1: e62af06ee7eb03c7eee6ed6af0837ce21ad0390f SHA-256: b14735a6119074757f11f8aa200132b6de245cb18f1c7434d14ab974cdecddec
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary goal appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://es-manzokudou.com/yamituki-n/uploads/files/pomafubopiw.pdf
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/jegobemobatikiked.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zugumarepunemanupopemipoj.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/64119398073.pdf
    • https://fallahi-sch.com/userfiles/file/25198990919.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300a6deb4e6---29868567110.pdf
    • https://coop-alternatives.fr/images/images/pifejezabepefuba.pdf
    • http://chinajnbt.com/images/upload/File/dofotevoxegatorok.pdf
    • http://ahcxdq.com/uploads/file/170615173434.pdf
    • https://jgranit.pl/userfiles/file/46810970226.pdf
    • http://jr-bang.com/uploadfiles/20210916205431.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/974bd630ff686ef67d21c3bbc26e584b/zeligijetunujeju.pdf
    • http://southerncross-ex.com/images/blog/file/medijirulojejesuzu.pdf
    • http://culfordequestriancentre.org/UserFiles/file/wuzasuwenivoleberirenur.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416dbb5c275---mewisub.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ac8349ace3b58c561494dcc764bbe9f5/tojukuzarodetetubomufabu.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/36173955048.pdf
    • https://confeccionesruiz.cl/UserFiles/File/mawivawukirimowepebofo.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385c58059f---doteminatobezodumufonan.pdf
    • http://hunicorn.hu/userfiles/file/rikapoxulakonejefivu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=game+ppsspp+call+of+duty
    • 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_off0000cf36.bin
2b4288ebc4a8f03058830aa2efddf678796294dec3e9b63fe3f727e7aaf6d7d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 10740 bytes
font_01_sfnt_off0000e800.bin
ee76ae5c92e2d37ec397859e5cb221ec4e05004e29f3dec4502f3ed4aa7b3ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 17652 bytes
font_02_sfnt_off00011569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes