Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecb77f21aa71ca5…

MALICIOUS

PDF

104.7 KB Created: 2021-08-19 08:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 137bf6ebb2ba8d0a9cd6e3fe48391523 SHA-1: 118f9fa567da008c15b40ff1a7fec018b12f6551 SHA-256: cecb77f21aa71ca5e59d2338e44824b6cb694e1e52adb960290cab74feec965b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://coretry.ru/uplcv?utm_term=how+to+score+ataxia+nihss PDF link annotation
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c1042fc449928c4e1536f6f7304b687e/84371366786.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0da21d900654555e165e6938d276e232/71194877070.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/37887652067.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb971d475---matito.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096064a6eb84---nofigun.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bde897e1---56875491748.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/13007552995.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/68733287578.pdfIn PDF document text
    • https://ancoraeducacion.com/images/47016474601.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/19658615796.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml6vl4vkv13gpj4phe1aiqsu6f/zuvidefumerenaxoderigom.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/fd67338dc901d06c7dc232795c6e6e7f/zoderepeluniwukapawo.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30919898149.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/gajilu.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/15675941137.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608afedb801b0---tuxebumik.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/20b2cbcaa697e687cccf02c9d5adae35/62557628544.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ef20073f---sijipu.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/90811059900.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/mibubotukamobufu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/refekerazom.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/5334199338.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/8913015350.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/70b08d63183c7e1c36bf1aa79270a3f0/88486809093.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/51255374028.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/zuravabuzefomijozu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tq0eglvtu7t21ison6ngr6akoo/32090363237.pdfIn PDF document text
    • https://medlineplus.gov/ataxiatelangiectasia.htmlIn PDF document text
    • 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_off00013691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA3 17636 bytes
SHA-256: e9eff3f4b0fa832f1f8d8882e155c18612347bbd9a3b9f145d0b44586d9e9794
font_02_sfnt_off00017cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFF 10460 bytes
SHA-256: f477bcd00dc1197e1f953c7dc1f734e2b4e94133cec1ee3fe0542b68d05c5203

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