Malicious PDF — malware analysis report

Static analysis result for SHA-256 27861cabd8c2c7ab…

MALICIOUS

PDF

118.1 KB Created: 2021-07-22 12:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9b2d454db698f139d0f5adafd4786c7 SHA-1: 97d67bf7fa2c4783045fd271d5a8e0b231d06182 SHA-256: 27861cabd8c2c7abfa15a94eafdc3147337462c58651fd8bdcfc837ae5563457
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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 https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4033876c8---tetadojulositijeter.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c03d46ca2f1a75dd37c94b48e8a4cbe8/30613049542.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ae7be33d67---64759441528.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd871d3c0---xasokufatopobo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pin4st1v98msnl5lkv5pkc0pf6/53781656514.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/99339201121.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/59281451794.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5f09de2dbe09adb160a2b4e8ac5b23e3/vixir.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/vuvaxexunekoruva.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ocn96sai97ee0474adlk7cjdkv/nudajagaluluvibuvikuxam.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e534de0c---tezosuxuremizobiti.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/panox.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16070b261964c8---92435842842.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e771393f8d3---lemoguzisoja.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fbc5d20e0---860749156.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af70b0f17f6---30681593174.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/towun.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/93672845364.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/97064123865.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210708214458953.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4ags9u4ntk6ngb4m5kq5sq0t14/31485195629.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/pajedefapuv.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b41c5edfc35875382e81819f4175a321/buleped.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210621002442.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/idk9gm020j26r6m6n5ggi26r02/wuguno.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/23696328346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=favour+meaning+in+teluguPDF 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_off00016fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDC 16448 bytes
SHA-256: a741dd204fdaf7f3fe89a7498075ce94793414337e1c62152b5a0db14b1aca2b
font_01_sfnt_off00019a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B29B 10424 bytes
SHA-256: 05eda8371ce67d209dcf5ac37c0c37569f9570b44ca814562a78d8dbe307736a

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