Malicious PDF — malware analysis report

Static analysis result for SHA-256 767b924f1386b6a1…

MALICIOUS

PDF

88.1 KB Created: 2021-07-05 21:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3e99ed540ea9816a5f36cbcca1e9687 SHA-1: ab36cea773bc2a7b2e1996676245b23404d111dc SHA-256: 767b924f1386b6a19b5e4f8e3e76cd57c775aac230259eed65984bbfdec2190d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous URLs imply the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=my+heart+makes+me+cough
    • https://speakingparrot.com/upload/ckfinder/files/xovusilodine.pdf
    • http://rolmech-strzelno.pl/Upload/file/40393579709.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5lq37q36v3qadpa6m7gie27h96/zutulemukopib.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44411058c---kosozemuguvak.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b228c6d29---61949384142.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rck97l072kh986v5n2o18g9jg/38540493290.pdf
    • http://brainbond.ro/userfiles/file/sumosafoxade.pdf
    • http://historia-bfured.hu/userfiles/file/wikozox.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/26j218sfjf9a816jet98cqsf4m/69605951938.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6tlt5o0qenatv12490n89ikop1/nigusafepexodaxaz.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ilmhialle17gi1ctjmb5gvfojo/rakisasasovakitegode.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c14835b80---95313138068.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab65d6b59---49071440892.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5e73e96a---sesulatazapupimixiro.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a62209834---betezalidagasiwuxexuxatil.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/09gvn7joj28kbpurleenvg7p11/22936744160.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b284d5529---jenikofoni.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7712495cab---vudotaduvu.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/990d1cd38f50fec25551e26a2a899441/74777541240.pdf
    • http://avsa.org/sites/default/files/images/files/wubivupatexuxeniviro.pdf
    • https://daiichitravel.com/uploads/news_file/tobosujigeturizuzorew.pdf
    • http://kiavysocina.cz/UserFiles/File/30074345400.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5aebc2e63a964245a6219efacc0454ca/15655722294.pdf
    • http://vetranhtuong.info/luutru/files/bodozerukuzo.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_off0000f5d1.bin
a2ef64a8e573acbcd2e23b53a7edade5de33cb54515a4d4cf929366ae1b312d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 17048 bytes
font_01_sfnt_off00012225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
font_02_sfnt_off00013a3c.bin
e96c391f6b335277961bd566a2fde111e022de94b65408e0691ee2283f597c04
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 10736 bytes