Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfb8062f06cd6e6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 00:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bdb8819c2636d7a73e7aba377fba938 SHA-1: f8edc7cadf6000241935024645d350101f051c74 SHA-256: 2dfb8062f06cd6e6cc613c57a7e38e7093758767267e375be3fe717e3dddb301
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF is designed to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://musclecar-taps.com/js/upload/files/68055724268.pdf In PDF document text
    • http://royalwedding.jp/images/blog//file/gefabekofi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/84009700811.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/34553678103.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/22273582438.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/pisiritanupabil.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/943ce1eb872b87870bc2408c523fac7f/73512977590.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/pidulek.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607648722f249---nogotibojigalu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jipikibolor.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///50976790456.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ef0d4bb97b9516a6ebe582254793b73e/xakibamumolun.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/juvupanutibumone.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/fadinutebo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/75650372246.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/325233845559af45f3510dba57df3151/48770349388.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/1762025979.pdfIn PDF document text
    • http://brlairport.com/images/file/futisibuwo.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609846f532733---55349526074.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd24221a67---35667124638.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///vegugilutuxaxafo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea8d817---turunerogula.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/fojejimajugetujekerel.pdfIn PDF document text
    • http://sooclose.eu/upload/File/7317043388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=odyssey+licor+manualPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 18104 bytes
SHA-256: 68ea3914ee6901859ff5d816fe8fcba44755f647d938b93173dd3c1917af26c8
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 10672 bytes
SHA-256: 82d5374da1346462146c2015254588282a75594935fc3f5f5466d11d2ca4e0a4

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