Malicious PDF — malware analysis report

Static analysis result for SHA-256 00349b2e1ed9c3f8…

MALICIOUS

PDF

87.0 KB Created: 2021-07-08 12:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5dbb3e9570f7dbc73628f4e762d41f6f SHA-1: 5bdf03f24a475de9bce90db531e7f8ce11f2242f SHA-256: 00349b2e1ed9c3f848a14c1459f7e1b37642377a34bf582d4e62e9d6c1051de2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several URLs point to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc08346f1---86212817281.pdf In PDF document text
    • http://yjccnc.com/upload/files/21566743458.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xaxobixepunonibu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a3bf9c7dc9d3833dec77b3112a235a43/mizitugojopuw.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b5dd9ef---gavusap.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/424d00e514cbe3879c469732e5ae0066/97021218179.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/45465628388.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d800bace0c29b99ee49ca3a6c474d420/lewagavijiduzunimovof.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/onbekvgetvujqcerrsrih233sa/21221738940.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/179860ecff433b01510084df3e515a41/divupuxixudevava.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2fc9fdd---69796645235.pdfIn PDF document text
    • https://olterus.com/contents//files/jukin.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/pixile.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/69003702151.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/26643860779.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72331dc5dd---66911224697.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf2691aae---98861599659.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d65c90af---3214753303.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/gesidevozesabupipogulat.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/66479141381.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/93930944427.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/juzipodopavag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/26e9a30f68331ed2609ee9447b06f449/844237628.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092986eed07f---divotovisazawuwerexusik.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kq8gjr625epqn4odivkim983qe/12868617706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+little+book+of+ikigai+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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 19012 bytes
SHA-256: 7c4fd5cdea6a00cddebe47ac350cb93e9024422e5ba960ef808f4f57b2adb49c
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 10600 bytes
SHA-256: 9f03afa12c6b61fccdef1e09d0f2f7a0bb8c9e3899238d01989755eb31141b0d
font_02_sfnt_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1