Malicious PDF — malware analysis report

Static analysis result for SHA-256 825f33603468889d…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 21:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8110d17ef2a768af6be2d505ef67c36e SHA-1: adcbb1df31f4c33122f13accb02750ad559b125b SHA-256: 825f33603468889d9cea0491cc5c4db0206fcb3a9c818c8c23699d53cfc1f22c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for malware. No scripts were extracted, but the structure and embedded URLs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=hiccups+in+the+womb
    • http://uppercanadatwocylinderclub.com/clients/877835/File/29237516826.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f7aa85e8---95724141633.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6c62db2359e6d0c90b9047164649a8b/xofebuxapesozanomem.pdf
    • https://aduanaldelvalle.mx/userfiles/file/wamogepovaki.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160963d4def320---wokoxoxapined.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97819b6de---84101727732.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39044d0416---xitegufunasemuz.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64611c776---wuxodevuwememuse.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742224577b6---72377268507.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/922725d669fa727a7a7c8393ed16dba7/90733227920.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/xuxezufemus.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/87f172b8eb45aa86dea579dbbb8e74ce/86968505980.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/dudubibusipeti.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kocuct5bvqko4beem2n1v867jk/nedepepamamafaletolikev.pdf
    • https://bnbcostaverde.it/userfiles/file/vuzano.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/clo1ptslcl49hlktf27ml63tq6/basexuz.pdf
    • http://kaowei.tw/image/files/20210528_094248.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60732994516.pdf
    • http://archi1919.com/smlclub-files/file/molupuzuvezakogu.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111e09bd2---70434296693.pdf
    • https://alexandrapanayotou.com/web/images/static/file/5099727908.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf70e8f35---vatetulusasipatoruvozige.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2v11mbkto8fp2qio01m05mpr42/93671326996.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e7d14c1c7c6fd467d28b04529ada5c21/sipas.pdf
    • https://agatanorek.com/files/file/48685031106.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3vv2ttsnr87v8b5hj6nto6fgt3/17490920545.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_off0000f24e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
font_01_sfnt_off00010a65.bin
0c5440141035d95c5e4b0fc0f5d0801b8901bca9c136212a52405af990054fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 10648 bytes
font_02_sfnt_off00012269.bin
c059dbed459f7bd84dde411e08f368b09846ba51de7f56e87057e687390413ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 16908 bytes