Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cda5c4064fcd16…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bdf0da1e3038fd72d722e9d0d5e5829 SHA-1: 85b3904034c773c122c7401d68938a084c32a392 SHA-256: 49cda5c4064fcd16b1ebb361072cfa086b26519833ea8506fe21c1458eabe0fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nationalshield-uae.com/userfiles/files/fuvoravijubaluvog.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f15a63cafbbc0454e2e10850d96f4e60/35291843184.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/tovizet.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb8409704---76093343545.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021081605415173499.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/kowosasepepigaxipij.pdfIn PDF document text
    • http://splogservice.ru/content/file/71138832218.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69ee59b8f---81929248479.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d6e3a16b82ac43ea70a215f8451ac0e6/kejesataguwavegerixadem.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gisid.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/777b0f419fd3250a4e8a5ad120cc2aa8/18433101373.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/30473145868.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3f90f818---313716119.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608de18089e6b---70411503994.pdfIn PDF document text
    • https://egca.fr/userfiles/file/8123826592.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfd114d02d---dugafenejijebekolujev.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/16141789234.pdfIn PDF document text
    • http://01host.ru/userfiles/files/36615010802.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/nuzelupikige.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b364611f1---bewil.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2g9nvb3u5e93u57qa2krff7kl4/muzefanub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=managerial+economics+notes+for+mcom+pdfPDF 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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 17700 bytes
SHA-256: 038132e4021660c3f043a64fd3a83b614e743404ba5b84302addc3d5a431be98
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 10956 bytes
SHA-256: 36bc8e2f389842dcdd02c8b2309215d2f7b7803334db15ac2df0b31791484885

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