Malicious PDF — malware analysis report

Static analysis result for SHA-256 88993d81ac1b2a48…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 07:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e91532b07ada1f05efed70004b76310f SHA-1: 31c4f6e5b3eba8eed0bfaea011f9b0cd361014b6 SHA-256: 88993d81ac1b2a488a756f8c64c14ff85011d3d0e23e300e5bc794d818d2df75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=prime+time+1+pdf+free+download PDF link annotation
    • https://samsungklimalar.com/upload/ckfinder/files/33981331827.pdfIn PDF document text
    • http://888chji.com/userfiles/files/78208866181.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7e9a0a26---26952484499.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/65354033335.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kametiwupurudo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fac958b8e---32764401456.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/ropunik.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/98831900859.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/jezoxarulixudaxijofomi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xupiparelalunevujojijuju.pdfIn PDF document text
    • http://yibetter.com/data/files/tutisivexupejenudorexukus.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6a9b4af69b95d93ce0bb4ca5f099977e/mubovelu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/terexevewamujezuxidoboxar.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/javebexexagexewopabol.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/43995295482.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/56453007592.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa0ccab04---sujojadokopo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/21281895571.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/6174939029.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/ruzitatoj.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e83356609bbb2a5bc2f9caacef5b606b/fedezo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e8e24be5---jasekupebezesemanowe.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/dixajakejebotijuk.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/97648171711.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/91016154138.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090223202438.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_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 10628 bytes
SHA-256: a790ba53498f63d74af90c9d69f69e1ceb637ecd9b5c9959b011d47d67ce53da
font_02_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 17476 bytes
SHA-256: 959d5d241cfc42385fc793be3cc57844c53ca111f0b6ee0001bbcce612bbfb9c

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