Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c314d5df27dd9ee…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 20:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b8d1499d804754ca469ad35fe8f3eb6 SHA-1: 91ff706ff2b6b6eac3a91d367e4641462db88eaf SHA-256: 9c314d5df27dd9ee36f65400d28fed5155d1db35e3e1f469d23bf938448838ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://allseasonsart.com/uploads/fck_uploads/file/kozabadanudutawob.pdf In PDF document text
    • http://dodogs.ru/sites/default/files/file/67666832078.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/konogatexinefodaxow.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614141ce67188---zinakepokisasiwo.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/99787478499.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f77b516a2cbd58706cb4417fb02b7b07/zugivuluf.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092300555939.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134001c06b41---fujojekomutapez.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614137906d54d---89362630606.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/nozewezemulomowafikara.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zolazafapenasinasex.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914014907.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d06ddcb130c3a7dd6b973dcff0e53e62/samamana.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/81284193044.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/38667750486.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/853318814.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/94536128119.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/41976509942.pdfIn PDF document text
    • http://travellerisland.com/files/xonexuvutidudubutugopex.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/vijilikonex.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/26540587973.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/3062747006.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/23050921374.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145c61bcd59c---77062198278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+sexy+games+for+androidPDF 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_off0000b404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 10920 bytes
SHA-256: 70d934f993df94daefdcea4a627fd38ee37de8fd2fb6de52b14d7d78bbb39514
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 14964 bytes
SHA-256: 8df382bbe00d80f7fbda6a9cbb950ff430667a98523ce768727599cc199d57b3

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