Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b350efa2cc05203…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 23:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 096fb4110ebb2d0e7b1e6a08edcb00d0 SHA-1: 67eb8e54fe78339abf69b7b4b3198f9215ce461c SHA-256: 4b350efa2cc052035a05a601d5f7309731c2cc6d98d16365250283b9b71fdf4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131098b40bc5---55496422779.pdf In PDF document text
    • https://pioneerlift.com/upfiles/editor/files/topibejotinogema.pdfIn PDF document text
    • http://domplus.su/userfiles/files/bidesozajesedisivunog.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3217a00a---xisilukusakenu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/setuxopi.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/62677802160.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f4e80238---32189471787.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/18720310111.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/90757850946.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/gusipopivijufuvazajosev.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/lisomamatama.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/41812335726.pdfIn PDF document text
    • https://patc.fr/imagesfile/rovuruveme.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/merigiwokewa.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/63060126556.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/3423279760.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210908193533.pdfIn PDF document text
    • https://activepymes.com/pub/file/37065734390.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/71282585492.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/fuduvowevetoze.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/72739049129.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07167252a---ruleguxinosusebipuvisu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/takefanivumedepobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=real+estate+license+check+qldPDF 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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 10528 bytes
SHA-256: 1ccec552e530285d096a69f266abcc922d2e739177b7874dba5b5249969d097e
font_01_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16328 bytes
SHA-256: 26a24845052615c15e7fe5aee65819f7461472c54e356f39a978fcea476d4df5
font_02_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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