Malicious PDF — malware analysis report

Static analysis result for SHA-256 2524bb7fbca3217e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-09 15:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2c50136ba3cd523b66a31dfa7e44d91 SHA-1: e457235f11b7f0a1478b95058a3ae0885fba1b10 SHA-256: 2524bb7fbca3217e2227f456479223c01740fc7eb1d651dae4d4b893535dc66d
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, indicating the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://smidgel.ru/uplcv?utm_term=worms+zone+game+apk PDF link annotation
    • http://gemwishrs.com/ckfinder/stones/files/jibijesosebenaxu.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rugijixakunutibu.pdfIn PDF document text
    • http://ned.ru/uploads/files/59379561101.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/folepud.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/gajudazapuwemujero.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/1250737652.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/lamasubif.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/27089217606.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/s87g89b9im6serof9r9tjk9his/vurukanevekemor.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oj39i7q3nmqhq3nso2mf1us6ec/5071047695.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/85325934809.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/29967018452.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/totikugavikotetas.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/belotugitelulevapifuparo.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/jawinasezokimofemoweluwoj.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/gopatumazawafapikapo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136656ddb5e3---12618366943.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/bunosezuw.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/junibo.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/welubojepesasoxomaxaful.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e442153a---bikererupunad.pdfIn PDF document text
    • http://beta-rc.com/upload/files/fifux.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/xopas.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/rakobukolujimajovotide.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/tafunililizabekosipe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10504 bytes
SHA-256: 446a778c1b149f4f2d8df2b7a2ca33a62a09d0c15b919a8775c31334dccf37ae
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 23596 bytes
SHA-256: a986b7e9c5781b81a28d34eb5a356035e2c7c83a0d1c67f74fa04a8483c04d99
font_03_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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