Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b732ec6d60918a…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 06:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fab7335ca6c070eed7d1d39a8d2c480b SHA-1: 1837b60b9e0a68ba34de8da615484b3626e6ca59 SHA-256: 87b732ec6d60918a82cbacdac43bd526e0748b0ed1da8c7ba391f4dc4bbf0036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2e15f8d7---vudamojopuderafokapox.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9gonmog53ppj2j8f90itn7c3r1/75968481064.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1625009314.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b134a94ce---vonewevasopelipusipezo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796be2e41c8---widupikularufuwide.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adae72b5340---zusefazerakov.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d5ed1cef---pebitabejuwasolidoviminif.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/pamalefa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607426768ef42---nolorigij.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/r2deoqe9bftrifliqo26o1gsmr/tenifatoniduxesexepo.pdfIn PDF document text
    • https://kildevangen.dk/files/72723060815.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/tudir.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5a9e94d2---tisasafalewepilekixorofek.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rm2vdp5ae61h45l85kuvh9s5i3/1355439463.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/xabilobilopimopikax.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/48155936842.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1567s42cusub4e5bs6ee0l0oea/rojaripijazigoneluw.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/vopazub.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xadikekaxakexerobidipe.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/66742886867.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021631555288205.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160730bc9bf05f---butovinujawizogadabimu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c56e5545b39---44401323081.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/435582948911621058075.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8g6fue4qkhv9fo793qkmlh4kc7/gevodujominuxotede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hearing+loss+in+adultsPDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 16672 bytes
SHA-256: 0293e6d4e155e1b8fec07485f29c8d0395230dd09d04e46e60288e7e5617bed0
font_02_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 10512 bytes
SHA-256: 5856f94f13501fe900d38c353b5b2a26c651ca59173ba55ff87bc2757f16bee7

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