Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b10cd962e1b0040…

MALICIOUS

PDF

123.2 KB Created: 2021-07-22 19:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f79b409313eb40a0744b59acbbdf528 SHA-1: 7828a3ffa0faed9fa0f7d06aa263133adfcecb2e SHA-256: 6b10cd962e1b0040d42dae9d05b576c1c4614ad0039285d9c29b88e110fe8750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to obscure the ultimate destination. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple PDF link farm heuristics suggests an attempt to distribute malicious content or phishing lures through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4048e9a57f68226e916f618934031ae6/nuxometatirus.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e486f07636d5a414429a62a14afd40ab/lojaxij.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/getijefopusudota.pdf
    • https://vgi-vn.vn/app/webroot/img/files/32834164256.pdf
    • https://fizjolech.pl/userfiles/file/xemelepo.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/22737333391.pdf
    • https://betenagro.com/sites/default/files/file/zuxazifapalumafofewiwa.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/atsoc4ohvutmu1s808h6c7kkm3/91867583533.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9a7a7431b5d87f8cc7bbe05eb42c7ea9/juviba.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d022228083---jowobemixifapumakalexen.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cc6925cf---gobezijilawotofixim.pdf
    • https://dvg.asia/ckfinder/uploadfiles/files/88073224691.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d3dcc1ac7---butefepajozo.pdf
    • http://terezmisszio.eu/files/file/70451922327.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7p81li320hksurkhtnj6orm3ap/padutatamipiporox.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6fa530fb215667216c027224ea53992d/zatujavofunamon.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/172bbb05a0489a1adbaf98fb8ae2d989/59574157021.pdf
    • http://studiolegalezullo.eu/userfiles/files/31340110400.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024d42e571---juxadumamoxipejowipubul.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4a418689deba26e49703a53e0281ef9b/foladazetifubapugikikina.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160def47971e65---murikifepu.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fb87e98374f4933a94e91d500c09352d/82589366445.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082668a25d75---lipugiruvozoriki.pdf
    • https://danielstrehlau.com/userfiles/file/wefasotojujavibefes.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c081b576---bujobitetizexuja.pdf
    • http://traiteur-ribot.fr/userfiles/file/tikaxonikoroma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+tp+someone+in+minecraft+using+command+blocks
    • 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_off000177eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x177EB 16792 bytes
font_01_sfnt_off00018ffd.bin
b0a0af2a7b29a36d7f38d62c35748805889343d72126967c9ff5322cd64318ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFD 18308 bytes
font_02_sfnt_off0001c0c9.bin
59d40bdf8e9019f9cd827706bd1c6b9a3a490465c4e60c2ba8d6c493fa3d39ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0C9 11372 bytes