Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d1e6f649e27565…

MALICIOUS

PDF

78.2 KB Created: 2021-07-29 18:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd60076df41dc4e8ed89d916bc800da0 SHA-1: 28e7cc34bd9638bd5b1f6f178dfc91e408dcbb02 SHA-256: 79d1e6f649e27565142124c0c2e8d41c24ada4a1ebee04df71b43fb97200c625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://pistant.ru/uplcv?utm_term=steam+distillation+experiment+lab+report
    • http://studiogiamberardino.it/userfiles/files/vetutalupufekime.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b87f00ea---wopakedazu.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd65023621---faranotekote.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df304c7bccd---jubemiwabivuvuxemoze.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a73f0d14---43013461481.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89784a47e4---65877737482.pdf
    • https://foundryindia.org/userfiles/file/nibubuzolagedajenakode.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097456be52ee---wegazinavotipa.pdf
    • http://agroanaliz.by/upload/editor/files/tizudojoxi.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ptare2lt3qntc1hq8utq1fmq22/38185159714.pdf
    • https://hospvetcentral.pt/site/upload/file/68422869609.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c88305c270b---60344703273.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4574aa5b1a---dezaj.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab126a76c6b---refezimotevunasafakukikuw.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc84826abe---85504645487.pdf
    • https://discovercefalu.com/_data/images/file/77458967503.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/84b7ef432850c5e6e4283d7ed28e7711/80541369144.pdf
    • http://sdds.be/userfiles/file/tazowodidugejasivepugated.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/muwomomifif.pdf
    • http://asbu.net/uploads/FCK_files/file/buxokipilitonup.pdf
    • https://nezrenpin.com/calisma2/files/uploads/54521325312.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/92182607603.pdf
    • http://k1a.ru/images/files/file/99476487285.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 16792 bytes
font_01_sfnt_off0000e53f.bin
045657a9696056dd6046c3e8810f8b148268ea12a9ee3b9a7e3c2c63e62d652d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 10868 bytes
font_02_sfnt_off0000fe0d.bin
a9fe5f16ef7b4763f760247904019cdf17e5c03f9dff26131499129f6297bbe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 17540 bytes