Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39952a64020074e…

MALICIOUS

PDF

122.3 KB Created: 2021-09-05 05:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06c8bfcb21908ae95f90d64e1af18c5e SHA-1: a4e4b0e89f34d7c6ac247e17f9997b38f8d9250b SHA-256: a39952a64020074e1c61d3f9021fd2154f6cf94b929761a3a8549e93d9796710
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://amdind.com/userfiles/file/gejubiwadefunidumolubu.pdf In PDF document text
    • http://ventima.ru/userfiles/file/nubapesogelurosiviwab.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/71844904304.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a362de4ada2---dumujoroburofab.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2u6lpqqn12h7vem4ftm2i34q91/38946974170.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/16266014360e774439d2fe.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c55ecb692---zuwixefe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8092a5a2---99666605710.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/liluvivubu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dup75t25irqssqpkab1eor3rbg/6569866913.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160747ac863a31---72382136395.pdfIn PDF document text
    • https://drsaman.com/files/makezebaxibakigoxaso.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/81373036248.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/51280690050.pdfIn PDF document text
    • https://lavineriablend.it/file/20511212365.pdfIn PDF document text
    • https://oliogalanis.com/file/botaburalosolef.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/berub.pdfIn PDF document text
    • http://effekt-film.de/files/file/11819639735.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/64444678258.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070002dd0ce2---79388923119.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/zumadibabafigokokidezeda.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2506ee6e11---rinixifopewopufeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=revista+boticario+ciclo+6+2019+em+pdfPDF 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_off00016e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E72 11556 bytes
SHA-256: adbebeaf5d6106b4e4163ceb5e470f4973dce4783351a83310eda7f2431e4bbd
font_01_sfnt_off000189b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B2 22328 bytes
SHA-256: d8850b7e149ed007ce74381484022360c2ba1effd1c3385e7ccd1d94840d7689
font_02_sfnt_off0001c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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