Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93cfdb0b734b9fb…

MALICIOUS

PDF

115.0 KB Created: 2021-06-29 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 364b42b012a7e65f5a0195fc01898ec2 SHA-1: 15ea10de1cdc6a81c8355100c993b364cf86722b SHA-256: e93cfdb0b734b9fbe6aa121a06d8e6ee660d55a411d28b51d28b0b597a87b52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The embedded links likely lead to phishing pages or further malware downloads, making it a potential spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe27683de---83795928098.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7427019e9d---72270491217.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742326d9601---jiwexuzotoxekilonup.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/54431919337.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b640ebb9---55070004234.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/17643967634.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/winin.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/mumagevu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/122drujc1gkc988jd5vtdc9g58/93149526721.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/9306319828.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/53b626d617e41e0b994db08aa6decd6b/vafubepuma.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607728160f26c---39257342763.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46c160b1bee4374e6fa5637b42727e5e/putokave.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/46550268253.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bp3bfj6d75puad2nobcblia0jh/vonigafidefapidujovuz.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/79403634017.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52df6bd3979807cb87be605354af836a/44513139013.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e61a246e9---wanefemisuxazozogikupeju.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d59fbec34---todudu.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/filapabunavarefine.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a084cab8c89---81691307971.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f7d297a5---tujanutufikosugonet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=to+pack+a+punchPDF 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_off00016076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16076 9988 bytes
SHA-256: a52df6a98ff0c7befbb76194be3fb4e8ada24df18b312fa9b6e1627e44f013f3
font_01_sfnt_off00017683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17683 18672 bytes
SHA-256: 7aa37779662652311ffc96b304fca097f53c276f88afbc5106b9d87d1513636d
font_02_sfnt_off0001a74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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