Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5e7ec95b963d66…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 09:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2aeab546800e98e3d62e51dea5c5f72a SHA-1: 2fc107bf8330f0786db9eba687736771dc1c849f SHA-256: 7e5e7ec95b963d66bfac012f0608b04c14c01b9cc51b1a076bfc974b77f0e5e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=aspart+insulin+davis+pdf PDF link annotation
    • https://b2cexpressdemo.com/userfiles/file/972887546.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/tebosetovokevexoxevu.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/konisatikasamagojovip.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d358a6b2f55---bijasevogebubis.pdfIn PDF document text
    • http://rococosofa.com/files/files/repasawawuv.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/4742722781.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dceac19aeb5ba86bb1e384480865a7b8/refazibuve.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/tezisugogopelalu.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/26013344354.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9eb02e1a---tupazitotutiziz.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/49615199419.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f9b13730ff4f162397cf07152575f632/13676562341.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aecd3ec9a---13860269458.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/31643936782.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/begibalesurenitumagubadol.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafe10c022b---73496029500.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c3d0a8ea3c4d074042b0867fbb6a47ea/rojirepijamorazefo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xavam.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c2114a6d1a38fa64dcd63fe3b60e3cfe/42820952461.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/57425096141.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/52909412708.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/njqija1jtq19lnamic0st540cs/73660767866.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/vepebupolibe.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7784295f3---sovivavubejuw.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_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 17728 bytes
SHA-256: 3a7ecbef0b1b2e90f42beaccbb082bbf1a7dcd098bd357df53bd4de68ac883d5
font_02_sfnt_off0001406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406D 10384 bytes
SHA-256: 015ace88f9b82b74b98b33c908ccae7298282720418319adaf3963426deeee63

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