Malicious PDF — malware analysis report

Static analysis result for SHA-256 25388cd45a3461bc…

MALICIOUS

PDF

86.6 KB Created: 2021-08-21 18:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d342a8d25e5de66e7289f763f8046d88 SHA-1: 4f22eaf37612c63bf82c24505ad2637621334ec7 SHA-256: 25388cd45a3461bc30e3162a34961185bfa598f626a77a584587a1602b6deda2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=how+to+get+a+bikini+body+in+12+weeks PDF link annotation
    • https://aneri12.eu/res/file/77441354472.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608439f06d081---44663876528.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/roxixovix.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/solaraluxifajex.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/rebefoxunoluwisafepuzewe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f70082fbe---41642910285.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a413f112f68ce37fe16b2bf3ab36ab87/46463428292.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tujisukedorop.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/81109443151.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcc7e1619---94834323476.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/41884899960.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • http://brlairport.com/images/file/vawewowololuxufomatadami.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1610e000f5fcab---22951295439.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1985ca1e60ff0417db9935a0dabac544/93901749137.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16107f9771fcf8---48643245549.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab669aab7---ravomopojikefubaka.pdfIn PDF document text
    • http://packamate.com/userfiles/vipodakubigogawubaluvolos.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/62270caea7142d8e10a6f4922e17ba17/kixafunefupunaso.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/95444092047.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3af99ffb3---60132229671.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611800e6e71a1---40586133691.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b7f43e1d80fcd2ba2d30c35181565710/58790185822.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/60c46c6b97f628cd83b367d334231a1b/56903023878.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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 17940 bytes
SHA-256: a22e6caa3459e9d9ae8a916c9869489ae22ef6d448b43469361e58692a4501d3
font_01_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 10872 bytes
SHA-256: 770b2b44f5e61625fc0e47290ae62126902800440bdbf5356f742f6175ea4bbb

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