Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6488c0f8560b8b1…

MALICIOUS

PDF

77.7 KB Created: 2021-07-02 14:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd4047e2564ca5d4b2aca8be25ffa053 SHA-1: 5e11281e554f950b2e726cd6e71db481e72bca84 SHA-256: e6488c0f8560b8b1640230a9e2aed3bbaa2b9dd1a07a3bd03b5cb1090382d774
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to other PDF files hosted on compromised websites. This pattern is indicative of a phishing or malware distribution campaign, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a04d86bd9cbcbb13405049b896529d20/jesemebululazepu.pdf
    • http://ackerviewguesthouse.com/userfiles/file/sowima.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hdi16e4m8u7mra3pele309ilf6/91636132995.pdf
    • http://farmaciacogliate.it/userfiles/files/fabifanudevanirabelixebo.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdce5eb715---41422169340.pdf
    • http://forter.vn/hinhanh/file/97730197200.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/162122501521.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fcd96965422ba01d4331844c40a08832/99477948985.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076da960894a---narada.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a515cd1dc4---35162244261.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f1b1e5bb---44766714207.pdf
    • http://gat-asset.com/CKEdit/upload/files/finividubovel.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0c361a9f---46086428361.pdf
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/mumasuzo.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kn5c37a1e002a7v5ec4tuu37g4/67585599355.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/098541f9067f3badbc8d3b7af275a530/kinukasinezimemijaru.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c15cb415b---rilamajelagizefudavavu.pdf
    • http://transportdiverse.com/uploads/files/pitunofowosesirapudowaguz.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c5d5a835992892359a368a645c526c9c/kubuju.pdf
    • https://genegurumiraclehealer.com/userfiles/file/mofulelenesufetunabagev.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a983d17ecfb---wakilikajovexegububeda.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/35638860052.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=acg+south+insurance+agency
    • 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_off0000cbf0.bin
875b1c7fc2739022dbd2d089baf912a8264b1155e589dd2ccf284a11db9f106a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 10660 bytes
font_01_sfnt_off0000e465.bin
b6f5eb5d7623b9c773428f33cf196191b1e06cfbf648b4429a1deffe9f6d18f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 17248 bytes
font_02_sfnt_off000111b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes