Malicious PDF — malware analysis report

Static analysis result for SHA-256 7013d48384f622f1…

MALICIOUS

PDF

90.5 KB Created: 2021-09-07 21:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 660b28d49c967ae2c6c505c03d1f323c SHA-1: e3102c735fd0eeab2bd259a1772d6548727f83da SHA-256: 7013d48384f622f1503de62121a8729fbbfb8fc54d23c10bfe6dac29046634fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm designed to direct users to compromised or disposable hosting sites. The URLs extracted, such as 'https://huntic.ru/uplcv?utm_term=comment+%C3%A9crire+un+cv+%C3%A9tudiant+pdf', suggest a lure related to CVs or job applications. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=comment+%C3%A9crire+un+cv+%C3%A9tudiant+pdf PDF link annotation
    • http://mjsolankifoundation.com/fck/imagesfile/xojimovariburoxiv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/30016522482.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/i1if179b3b40v2vf94qmhk8s62/jevolatasobegumiwawob.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/bezemame.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bapujuwalik.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a495a05d83fbf17627287273e48fc1d3/32910105043.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pitazofatekopavanutag.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/65842547924.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zefubolopezevuzobaj.pdfIn PDF document text
    • https://x-software.cz/data/file/45104037681.pdfIn PDF document text
    • http://dobermanncz.eu/files/dozefukefuzekekowemut.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/50891127053.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d14efe1---nedufevukad.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/97765475136.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f0ecab15---52564386147.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2458941295ec59523ccda3c08f5f44c7/rukidituzosijiwazu.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/41399001564.pdfIn PDF document text
    • http://cjatkinson.com/userimages/nadoluwemerazovipoputolep.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p6pdb3fge06mfr946gk79euquf/46826707525.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/46222185015.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xasavepin.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215162224287816.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d44b6dc1c---67778531088.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/39b8b7b7bed50a86d7becc872523cd55/92238118033.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/94709351109.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_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10920 bytes
SHA-256: fde63bcb009fe76863713c68f3e283b071bfb362474d073248ca15c48b6f836c
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 22024 bytes
SHA-256: 405a2642fceb246698d5fcdb546e0a032dd2f5d093196e8a61b443d989aa5ae6
font_02_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1