Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dcea7d27e92fff…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 22:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19b184bc1b389e9b25bfe72041c69254 SHA-1: bb41521bcd1010510e4b358347669348993f3118 SHA-256: 63dcea7d27e92fff8148f5f20dc33ac4f319d454452dbccad452f4fb76b6df3f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huerural.com/uploads/image/files/foxixe.pdf In PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/tafaxogekew.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/bizunejipisaw.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/74587165797.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/noboxilixekigu.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pavalapiwelaluzum.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/nevopewen.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b1eb9bae---88252777421.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/12584003927.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/17231669741.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/zekosen.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/33236056332.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/sotosaduweza.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/rategagidemodibesezefu.pdfIn PDF document text
    • http://cascad-trans.ru/files/32008222299.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c5b678ea3---81692544987.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/dopov.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/mawizej.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/tubemiwimuxi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/27198500519.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/45345115397.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/46956633368.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/28624845884.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bb70117b1fcdd3899ff9e26aa606821/28386082620.pdfIn PDF document text
    • http://getvisa.ru/images/File/surideganixiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bloquear+celular+android+pelo+googlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 18732 bytes
SHA-256: 355252af2593a4c06871ea890dc5bc3a1b1b82927dc4b784d4c5563743396885
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 17760 bytes
SHA-256: 115ec2e41f05d374f545cfb732897930628b8b72f6b87de75f9fd969937b79d1
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10724 bytes
SHA-256: c366ba793a3554651c0e67d1c97d236f1b300f3a51b44f9e02897aa11d194849
font_03_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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