Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16d1dfac5d72cf6…

MALICIOUS

PDF

85.1 KB Created: 2021-07-10 11:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8073165fdadb73bb3618e79190990da9 SHA-1: 1512361ef03492448f2a5400dc44c330f7f3d89e SHA-256: b16d1dfac5d72cf62b0f77f0ddf2e8b149c4ac4fbc2306640822fc0ea6a1643d
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/288497b0577ec38e9aa2623231bde110/wobepopagijosomusopu.pdf In PDF document text
    • https://tonitomov.com/picture/file/sozolanakulut.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/38192903.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/fomejofonipi.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/vapozexanom.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbdfeb662---nabiwix.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/98002716764.pdfIn PDF document text
    • http://nfc.soo.jp/file/toneminemowuralobupala.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/xopim.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78962605647.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea91e21c6f---72395761746.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12f52e9962---tofik.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/kovabilisosefoj.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/turamakanuzukur.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bf899f2a---86987595917.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/mimeserevufofepore.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/wevuw.pdfIn PDF document text
    • https://people11people.com/uploads/File/9107307552.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bee24f55---xomovamogupanawiz.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6257cb869---22283003107.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/kilobiwewu.pdfIn PDF document text
    • http://abnicum.com/files/file/repirebufu.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/15192547991.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071442c17b40---wizokavotaworebedok.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebb59e027---43494019936.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n7cc0u3tnavc38rfv5h3ol0ad3/nizefafadevedufuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cover+letter+postdoctoral+positionPDF 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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 10604 bytes
SHA-256: da8ab365c659682884977da4d7283dbd9260d46a0fbb8ac2a4f76610bc3395ed
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 16680 bytes
SHA-256: 5bb6bc3ede37aad622212d1ab0b2902009c7f62e5960951a21cfc377216fde73
font_02_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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