Malicious PDF — malware analysis report

Static analysis result for SHA-256 f651b5d7fca25abd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 23:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ac5ff2e2475d3189e84028dc23a9ea4 SHA-1: d1a943168561f27982cc39aee7cb7be1c2e33581 SHA-256: f651b5d7fca25abdb976029a48b2deec5343d90a93789e2fb646f8306a13a4c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136192f83374---gizirawagorepaginesevazi.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/92820507119.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/namebiworotubexaje.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/gutulujebezulidomopalipi.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/90675835223.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nolibul.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/pabig.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/tusujaxof.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/lafuvibivopagivu.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/38304925966.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zusatup.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/20464365626.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/tafilibexeli.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/juruvozorexe.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/zosafadines.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/pokaxixapazomoleweneloja.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03bd33c69---depogexezew.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/45785248302.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/mogewowazopiguv.pdfIn PDF document text
    • http://irths.com/upload_files/files/88017619109.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/8516209549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chances+of+miscarriage+at+10+weeks+after+seeing+heartbeatPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237503ac1a---2471220079.pdfIn PDF document text
    • 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 17184 bytes
SHA-256: c92519798e1f3ef0a6d2378aec8e27280c6004aa728c32e776e6f368789b5566
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11260 bytes
SHA-256: eab46bfab4579061b9d7fedf08e014b2405b92326473428d45b6023cf0511608
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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