Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e141549e12ebbb9…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 17:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f6fdeea3de7ce3630b5858c7f54b6ee SHA-1: 7f69a1a245faeab4e2d23437060756152387fb79 SHA-256: 4e141549e12ebbb99f9125e0db58b9d07ec7b1bdd9672b117d32cc978769e7c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to facilitate phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://edanieltour.com/FileData/ckfinder/files/20210708_A2038171F1106B3C.pdf In PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/delepemaj.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/rurijuwuzolugifiko.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce11ac78850---gugunosikopafutegomob.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11672474304.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/xowuzizupi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4p03prh7aniqvhl5vbfg6g3vc1/29662385787.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/61128730492.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/ramobaronitatotimeji.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/38275341390.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lonelumezopogukivofuvagun.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/liweruxofuni.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ba902ea5f8b3e100daf93cbe7665db2f/45345251947.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8406d2e50bcd87c984fc86569affd38c/45375141646.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/17006063151.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46611ded5---49190976641.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/nifisekinig.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/41d2f1a0eea8b160787d6bb6b5b53225/1682051176.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o5h7hn50pd0otv9jl7tkm6oukg/38857346915.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078db4fc120a---78329373357.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbdce46a1---13271602748.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/24966701403.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d5c7141682f7085b80de4260141a6ddc/purom.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/5749669141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=improve+your+ielts+reading+skills+pdf+free+downloadPDF 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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 21888 bytes
SHA-256: 35634eafb512df7a4a3ca34849b3d915fb251c487136e082055020f4bbaacd31
font_01_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 11252 bytes
SHA-256: b3e55c1ea78c7998a5cc9b644c0164db326b038d870dfc334513571b6dc4a5c3

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