Malicious PDF — malware analysis report

Static analysis result for SHA-256 0836e89f9b4f8e88…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 14:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 704e787669abf685de2887bd1f1537f5 SHA-1: e3d6deb39cc4c265f74d0085e74a5b9e62e1488f SHA-256: 0836e89f9b4f8e88f43f9a26155eee8bfbd48605ad03eb6c5c756040f14c6c92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160812a201dc96---rugomabanigop.pdf In PDF document text
    • http://lahma.pl/_u/userfiles/file/ruwinobivogumosesimopaz.pdfIn PDF document text
    • http://donghotam.com/luutru/files/47694143501.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ratesatiru.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/bumuzosajokoganozi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210719_F9FC1AD5DAFC88BC.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/29184903958.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gupevolu.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/23736889060.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/32853037856.pdfIn PDF document text
    • http://kelvista.lt/images/files/30501200991.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/durovisuferituren.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acda09732f1---wobitun.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f94dc73cc2840d5d44135fbef9d66bac/47000434748.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed94bc006f---julirutewugatojoforuxa.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/56008029961.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/34450f1fe872f08a769e4402f98e4a9e/fedila.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/fevaxegan.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/6473054666.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59f8da12c---54508635664.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1ai3gl6kj7itlcv9epqfr2htj2/lupugavagobukotifasupu.pdfIn PDF document text
    • https://banghenails.com/upload/file/kagekesavebaz.pdfIn PDF document text
    • http://totoumi.jp/upload/file/sebejarexetus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=eagle+1000+fr+manualPDF link annotation
    • 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_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 18332 bytes
SHA-256: 54bb0e43f244216928e76d88abf48375777af0ecbcb448980c228def37f86bf8
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10336 bytes
SHA-256: db5089cb9e2f200aeef68ecdf4ba00677cbc74e418452d736387d7715b36c4c8
font_02_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1