Malicious PDF — malware analysis report

Static analysis result for SHA-256 3517582e13044915…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 11:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 919bcf17095de85f620bc8695e7e2891 SHA-1: e8e0d51778b7b520384e601d49a98f77c78e51c5 SHA-256: 3517582e13044915682e6eb07ff5e3aee9a6334d1a1ca6a829e663e77d77a692
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple disposable hosting sites, some of which are compromised WordPress uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://belly.bpv.su/content/files/files/24211394691.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f697c2dcdb---41407353898.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210904_AF6285EF1A02174D.pdfIn PDF document text
    • http://jfe.hk/userfiles/roguzo.pdfIn PDF document text
    • https://emprenderem.cl/files/77294694197.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/12011433150.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/10550513376.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/vesemafebenedovoto.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/menutebikerudizamamuv.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/21098030128.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905191005409161i5imgt.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/68329460538.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee66b57655---xezixekutozasofuwaloxarel.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/veravonoti.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/22800626264.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/36129810374.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/864693995.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/956d6091174db906520a743aad2c598a/dubonezuxizikizole.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c17e99610---77511542954.pdfIn PDF document text
    • http://parfumland.sk/upl/81167729744.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/77323108064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+wwe+2k19+pspPDF 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_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 10616 bytes
SHA-256: 5b80a18dc829298942074b813490a8b0406f330c3bf09fa9775490a8509f4e9d
font_01_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 18256 bytes
SHA-256: a70c7aca8e72840b994fcdaba27dcedbb07622b66b2425275df1cf474e1a82a4
font_02_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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