Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8604bc42f94a596…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 13:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24b81ae4ee7c05f4e531cdb3731ba40a SHA-1: 4ceaaac55a43d8738364334ee493ecc35dd2ad95 SHA-256: f8604bc42f94a5967cc3e5b98ef85c3208b43a5858da0ea13edb9228af0ebfc2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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) 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://drafthe.ru/uplcv?utm_term=cookies+android+delete PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/710c4fd96dd3adbd0c1b384677dc2392/negef.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_CD86A3BC16CFF763.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/84621849196.pdfIn PDF document text
    • http://immopolignano.lu/images/lofejizasafozutibe.pdfIn PDF document text
    • https://basisnomor.com/contents/files/6268630714.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/vigejizopisewikuw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae1384bb9---munajim.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/13760041157.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84fd4a456---nakadiwetaf.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161374973c9483---76199545297.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/11253750971.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/fekewezujularidubuko.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dc6c64e3e29b63a56f5ae699f9da01f0/rubojuwozotepusu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/58038356693.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/kuxadifoxaxixikisiza.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/budozokaje.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/30655860927.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/fofubakitegeg.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/linidepimukijuvarawam.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/rawozivinijigigukawixitem.pdfIn PDF document text
    • http://holzbau-napetschnig.at/40442692160.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd03ed730---notekela.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/fogubisuwisim.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f031a4d27---93054541452.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_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 18156 bytes
SHA-256: 9ee7e3cd668e99cb0613ba9edc4c8e49063e72c96fb08aa6ccea548073911913
font_02_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 10364 bytes
SHA-256: 5be7ad2818419dcd9e6b2fed1b27f1c133481a58d9dc02f282128f27192803d6

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