Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e61bcc8f7a1561b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 16:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e5aec4b63c3a7fc8381baa166d714e51 SHA-1: 3aaac30b00f9f2dc9dcd2ff286312d3a0d82a29f SHA-256: 4e61bcc8f7a1561be60f7c5fafe0c3c3f88293183fee8ed6f1a726784a3440d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of link farms pointing to compromised CMS upload directories suggests an attempt to host and distribute further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document likely uses a fake invoice or payment theme to trick the user into interacting with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6427b256---fimenelinen.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4739bd7040---73658801356.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858388e9baa---71602184047.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/wutevifegobularuwa.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/vaxazufelabazilil.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/84215749090.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/66113866331.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b026b12ad---81314824928.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f99sp2st3oef7f2tr0v3a08fk0/bopusa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160949516b904e---jefojuminaf.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zuvalepap.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210709_8B314BF8CA5FC4DD.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vuvek.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b353127f---wijurujesesijelalogofujex.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/26757301069.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgdqqm40qq5lbprd01ipu9d2o7/45403847131.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ff970e6a---fenorelonodifivamozava.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/fed2ef27fd6e2616b2dcf83cba9396bc/22231479653.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wozuwajakisomupuvelerevot.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/korebiwemawusumunojow.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/98745930091.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e6c439d0---luwizarajufazonorodade.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a79cc646---fovasujunepopinaluteraj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0ecaf3972---junibesirafeleraluz.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xulanedonunixegiwosinet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=grocery+price+list+excelPDF 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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 18080 bytes
SHA-256: 84af916b5c7feb7eb5893f13a16ea89a4a2a76a6b1928ebd3716362e4d8c3c18
font_02_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 10356 bytes
SHA-256: 45644fef4544b5931e24bfd3c422d90b3528e4f3aec3470afc1ad40dab254cd0

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