Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a0104eeecdf53c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-21 08:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4791bf1f2334d4ec81d1eab610903c24 SHA-1: 6d498e570f54f6b929cf67a079bc54675ec32a0f SHA-256: 34a0104eeecdf53cbe3d9647abc6afb81c6d2295f93f6f3fd465732ad404fbcb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/349ffaba77fa8928b192545cf711b9b0/jezezozuriviv.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7abcf7c87c6dde813e5bc02af459c552/30045530036.pdf
    • http://hugslock.com/app/webroot/img/files/sanolomerawumipelaludodu.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/60786991555.pdf
    • http://alhambra.kopanramen.com/uploads/files/1560401927.pdf
    • https://kawanmto.org/contents/files/gibiradosake.pdf
    • https://people11people.com/uploads/File/59627889557.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/pulotadasut.pdf
    • https://theelementrama9.com/userfiles/files/dixamuzivixisu.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/nefimukawupesa.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/pulonuvusobuvogilojovawep.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/gelabetowozoperowuwelu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef20a7fc2---falazuwefazataf.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/nupotarex.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/98427623274.pdf
    • http://bluecars.pl/userfiles/file/wuvobajisozopija.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/zezuxuwujaxored.pdf
    • https://twinslock.com/ckfinder/userfiles/files/80696476727.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08dbc9c7d---katenokokonudemapazut.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146155e5636b---jokoro.pdf
    • https://turdv.ru/SITE/files/editor/file/69541765001.pdf
    • http://tetrafluoro.com/upload/files/wijagoroxixatamudu.pdf
    • http://4bx.pl/public/file/bawakojave.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/60370049502.pdf
    • http://techscreening.com/userfiles/files/95053896119.pdf
    • http://inica.org/files/file///30964581554.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tivimate+iptv+player+mod+apk
    • 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_off0000ec2b.bin
00f1282ee5ed6cba0524877c2e0083d3992bf208abd8c2eb6d2196089ebbb57e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 20376 bytes
font_01_sfnt_off000121b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes
font_02_sfnt_off000139cd.bin
093daad46caee588f8b75e44c2308a589f31ca66aae9f911535bc6aa44c28c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 10516 bytes