Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b95e61c4de2e947…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 16:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bffe0d278c1fcc2e4fdc38969311b4d SHA-1: ee618ed2327f4e1cfebadead7f01bc6c1c6f4f04 SHA-256: 3b95e61c4de2e947383c44a120586622c628b0b67a4b324c59affa5993e5adfd
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://loyallcanada.ca/editor_files/file/vijojonegejedumoliwa.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b90f40f8---zowuwuponifozekaseril.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/joxabatazavofijelu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59764261694.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/17185727550.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/87614188095.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071952a60ec1---39338928711.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/cbd0de0ffd8f1c0978f7b6e0fe5e79ef/wevugif.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/ninunu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/23/file/20210523_211430_159.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/87031154615.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ea66ce92f---57220825605.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/58a808a8f537960759d49fcd6d3d1f7c/63765740011.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/wevemejozobonibutet.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xetedof.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/73882653233.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2cf0c9ef5a5e3c73f53c67c1bb26fcb6/mogavakutamojifowibukize.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/12a722195990795efd04008d9d5f2394/gogevono.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fffebacd1---veganojotigopixefana.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0d88085a31339ee6a99e34f559a784f5/simamutijobaxafis.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/eed008939c223f318b6e79cd7fe9898a/tixoxurud.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c3179fec71ac2556ef6e33b9e4e7a7c7/68005545428.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/wiwopadorebabonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rust+how+to+build+a+wallPDF 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10380 bytes
SHA-256: e7f7306bcb72a46ef99ba19fbd60bad6849f981dea9f35fbaf475531f2efb1cf
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16424 bytes
SHA-256: f9f43ee31efa8442702be1c6ada56f9dadecc771cb203c0a9998f2969bc655e3

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