Malicious PDF — malware analysis report

Static analysis result for SHA-256 743c95ff9676cc11…

MALICIOUS

PDF

90.5 KB Created: 2021-09-06 09:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c692e0746d2ee5ae79d726fafb7bae9 SHA-1: 1999fec72553774c1be173552dba46b21d86cd8c SHA-256: 743c95ff9676cc11d5ddefffbae89c0d5e46eb7b3d877d5b80d8afb72cc82bb6
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS upload storage and a link farm on disposable hosting, suggesting it's designed to host and distribute malicious files. The presence of 'recovery secret / private key request' and 'urgency / deadline' lures, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or credential harvesting attempt. No scripts were extracted, but the overall structure and URL findings point to a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a43fcfe8fd4---tifonozenojateroju.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/57ca9b856355672c3da3c06f7ab6bb93/8175536284.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/linivusuretukazimod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/53fa731b5fddde554dfcd386f79be866/5122048773.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/19892489716.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/46668757330.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/vagikamipumuj.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/fesudavusigopufa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m5603osvcqdk2b059mg8ls1mt7/20587969819.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/79450079461.pdfIn PDF document text
    • https://oliogalanis.com/file/43358610140.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/1611869457.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/nqq4c82c19r7bk1g5v9r4d51ni/33269238434.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rozesos.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/xenitopunakikovovo.pdfIn PDF document text
    • https://angkagenap.com/contents//files/42299021253.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/24637664613.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/15704652435.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/woriwudemekiwulajazagume.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fa3082c8---xamalep.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/63384770749.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6ea727e1---19910869942.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/58750276908.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/63764882297.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bd1f33134381431b36a49f6abcf8c97c/22814773177.pdfIn PDF document text
    • http://rrbbhopal.gov.inIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rpf+recruitment+2018+advertisement+pdfPDF 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_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 11328 bytes
SHA-256: 4369bf36f889d5103098a66f524422e74ecb2262ffce3b93f7ec5ca9fa76ddf3
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 20052 bytes
SHA-256: 6c0b7cc8ae3abe8202e700692b3d664990625821035641ab5c0e03cf65c1685b
font_02_sfnt_off000143fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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