Malicious PDF — malware analysis report

Static analysis result for SHA-256 8845e5f505d8f1a6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-23 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3bf32bebeab2b5c4c9464cedcb4533f SHA-1: 7dc61c631a00fe322f77b6b0c9e6b8e8c702ffaa SHA-256: 8845e5f505d8f1a6eff81b7a486837b996c4d672a9eba83b459bfef367ba72ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c70814591---jedifuso.pdf In PDF document text
    • http://mya1fc.com/files/ckuploads/files/78255793662.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wobukut.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/liwixasalabetupewelejefi.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/xezonogufev.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/ruvuvafadi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/daxefegowitowofubugepogoz.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/92398244819.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210917161219_2034411661.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210912204444.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac31cb053---juxejisalunixezetafobikav.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/19165235480.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/4527904037.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cvhf3eta1qlg8k3cqrlkfvmck/dukew.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/83662609205.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161428a94c7a4c---mafijividimuzepul.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/16536956972.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/pigulemum.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/32141973296.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/58688293249.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902195504.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/48649834365.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a600655c15a5a5955a7972185a583afb/47361738640.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/vugunekosujowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vertex+form+equation+calculatorPDF 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_off0000b651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB651 10644 bytes
SHA-256: 1d37d1261ebe12259dc01da0a4701b900d6eb8f6fd24afe01a705530353e310a
font_01_sfnt_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 15732 bytes
SHA-256: 473dc76c0c41ef4c89abe9a95f421f93392ebec3c26d7d649b798d77b680ebe6

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