Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ee1b8bda9a343a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-25 18:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92d19dc397081005e5692f57023c3068 SHA-1: 9c3038b0698f0137c843dede4ddeb2ceb4a3f35d SHA-256: 38ee1b8bda9a343a31976003cae8fd562b6cdb1e7287c583073effa923d7aafe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://botosani.ro/img/uploads/file/13337710228.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbb5cef234---mataxezijove.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/wivulujivej.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/5002331982.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160add756f3140---mefupiputepefivi.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/rokokoxe.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083973fe8f2a---rixidujuvufakuxawojosev.pdfIn PDF document text
    • http://whatdwellswithin.com/file/71887570133.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/beseg.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d76478244---segimej.pdfIn PDF document text
    • https://cargotavio.ru/files/file/42626774519.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/janaxawepemenojufituxubu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bc6021920---febenimidunufiwekuxenili.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074461a468fb---xesapewiner.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gafijozeluxovox.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa068a3a483---42606908149.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/qerhf3mcpkr18qgnj3ue6nn555/64388540378.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/40450204229.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e73cbba63---1966464296.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608974c82a112---poxelugogedabojevuvadiki.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/16055436327.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/goxos.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2adggg0u8n40o1p7cdc1kb8crm/bibivunuzodegojaxozut.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/kibazirebajekezuwunexil.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/mobobopiv.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2b63c347ae5beaa85e1dd7f9df1bef61/sixesetelutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+record+income+tax+payment+in+accountingPDF 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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16944 bytes
SHA-256: 28e06630b9bc0332ba6f7d8b407af60a7dfc0b21aaa143de111e6f76beb5490b
font_01_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 11036 bytes
SHA-256: f73ea38f6c8fc00db97c78e6cca35deae93b1354255c64d3ea6fe43e08d9a572
font_02_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1