Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea8d6fa1c2703e3…

MALICIOUS

PDF

83.7 KB Created: 2021-07-06 05:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84261053aa4d15961ad41c67227759bf SHA-1: dbbf1806bd4f5474ab7a69ca715d0056362a7851 SHA-256: 7ea8d6fa1c2703e3d0f56d5433fa2bc62852a5c9e8626773501be4087de30875
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. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm, suggesting an attempt to lure users to malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the detection names indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://agronlogistics.com/userfiles/files/lilalitujesebokolizigiluf.pdf
    • http://altinellerinsaat.net/UserFiles/file/9536962700.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee78eb23e---52891296057.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/78501f5fb1255204dd3bb329ac6197a7/91527059023.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c165ee4e59f---zebixodosakoxoliba.pdf
    • https://digireg.nu/upload/mikijunigegirabumafapuva.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160870c73e9fe4---70898042952.pdf
    • https://aashianarealty.com/file/ninizuxalijijogevevuworu.pdf
    • http://bioscipublisher.com/files/upfiles/file/8504140538.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/nukinijosezi.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/kofuniwarinevazedelerimi.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076793b2ebaf---ganetimadizinatu.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zefagojobosufidipa.pdf
    • http://tecnoservizi.com/userfiles/files/xerodadavaxafi.pdf
    • https://pima-alarms.net/slicice/file/84343811663.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gabagewefevaruw.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50285ea1b---46660066998.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10d496519---dusajode.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8370565---93772908348.pdf
    • http://interiorconsignments.com/media/file/28986997453.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b431e5cccc---21722766518.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=online+cam+chats
    • 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_off0000e7f6.bin
045e878d3073685733a8691fd1db8327c67738711c649c9593a0c36cfee33fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10300 bytes
font_01_sfnt_off0000ff00.bin
2f7ce76a039aba68b9c6de82f2aba5b3dc8645f98ba623a526371b24ef60cf7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16608 bytes
font_02_sfnt_off000129d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 16792 bytes