Malicious PDF — malware analysis report

Static analysis result for SHA-256 680b5d46c0bc1c00…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 05:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 08d9c772d2ad2af4d8f3530095047aa8 SHA-1: 4ccc3ecea32a4da8dc10d47fd68f1c9995936ff8 SHA-256: 680b5d46c0bc1c005e1ced939038e34afc43dd9b9eb50821052131ff2cb65974
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious content. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://fiscalonline.eu/app/webroot/files/userfiles/files/zixebosokaf.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781951c0a91---67147778438.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609673f6e283b---14900743513.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/zimavodinesekidadope.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/58901461464.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/modefimesijokosajulem.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a70460dcbe---renedaponapev.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160836c3457980---jebaxupafo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96c4af87b---89123010568.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/daxapovuzuzoravarabusofo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/pak4s2oegh2s20ig3f6c1krlh3/fibelogasukuvenoguromo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fuxomerivovibajerebaki.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3ac3dc61---60970080682.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/sisovepet.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a3debf0c---20521782872.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/92222941009.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/85217732850.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a22323af7---filorawuro.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/buxopukiropenufelijipin.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee10c1110---48380247090.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1565f15a6021c846ec8ff05fb239c378/netizoma.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/50002971332.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/lukezumimufarenala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=add+cell+borders+in+excelPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1c450ed075c7d31d88ec8288ed78706b/zesifofezisokopo.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_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 17024 bytes
SHA-256: 87cdd11ef15fe8784030f224ee2e9ed1426041866fdaa8af3514d7a0051b7ed3
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 10328 bytes
SHA-256: d147dd321bdbd63956a8ca0f3747d9520d8c2b3e31a63765efffc5a592a89db8

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