Malicious PDF — malware analysis report

Static analysis result for SHA-256 088d846cb2b68da9…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 17:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58878a42b2edfbadc993798d1f79e5cd SHA-1: 0c79d77ffd6cc83658c7c249a9d107676242c341 SHA-256: 088d846cb2b68da95a9daab166788bc59983a712b5f420d71b66e21d1babe17d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics pointing to link farms and compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+to+clear+data+android
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2e61e282c---wezezilanibil.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/zofajumalisogiwuxorajowo.pdf
    • https://iohrp.org/f_files/files/80007420400.pdf
    • http://conomiya.com/images/uploadedimages/file/52686107479.pdf
    • http://ustunongel.com/image/files/66650519734.pdf
    • https://lordoptika.hu/files/files/78372167559.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b5176405---piwofoxapefobodekupokegiz.pdf
    • http://kaies.cn/upfiles/file/dugidisumegosodip.pdf
    • http://linpus.com/app/webroot/userfiles/files/97691344946.pdf
    • http://holland-ex.com/images/blog/file/tikisonakinagikurep.pdf
    • http://gurolmumcu.com/userfiles/file/jipolofereligodanu.pdf
    • http://retrievers.su/ckfinder/userfiles/files/telabiranazozuzerisur.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f163135f2f---38926454037.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/lipit.pdf
    • http://www.ondebiz.com/userfiles/file/40880963775.pdf
    • http://yuanyoujie.vip/userfiles/file/rixoku.pdf
    • https://egca.fr/userfiles/file/migizarudu.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/15485075722.pdf
    • https://chaletsuenodesol.de/files/64066102684.pdf
    • http://isleford.com/filespath/files/20210925045558.pdf
    • http://kfnmdg.com/upfolder/e/files/20210919024852.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c3ce0d11c80a04d874937476b19a18c8/64595895754.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_off0000b34e.bin
f8c3914d9e84078bd73aa4e7454f22314991ae11615d470a1da0fa726ff59d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 18736 bytes
font_01_sfnt_off0000e344.bin
d30121aea8196d8d2baf73c0bc94e202c2bdc98d491566a9cf5affc60b87cc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10272 bytes
font_02_sfnt_off0000fa7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 16792 bytes

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