Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e7f16053311a18…

MALICIOUS

PDF

100.2 KB Created: 2021-07-21 16:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fe682176d5cdfd37b3b514af7a40784 SHA-1: 1c716056e5c83a3fb28c2171ef0168ab5af2d153 SHA-256: 53e7f16053311a182361921968aee376f06bed7379033dcbef4e945935b95ad2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the presence of numerous external links, many hosted on compromised WordPress sites, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

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.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pdfsa9c6pu4tqr7d2v4gpfg16f/zikulunefu.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9446cb96dc033c1f2f28ec527c1c07df/fuvedigibutezo.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/68369142294.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/tukobuxi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076799acc438---lupapilabenewixebosexap.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1ddc9a17c---mewomojarolalegefaguxuw.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/7fcff815c70b12ecaa047d422dd54d18/kudugerikipinakatobevo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/35741976848.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/52642225386.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6005abcdc---37263802082.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4eb4820e6d0e1cdbf383cb4aed47e3e9/wuwiluwevisofitusolif.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0ka648vklv1ma170nhlhhrtp7/ninogowa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3950bed5b1---notenabifekonarejafuxi.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/25233489332.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/82846022371.pdfIn PDF document text
    • http://waypl.pl/upload/File/22698306604.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/makupevuzofinikofov.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/83475900678.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf0bf521f6---dorukobebukekotajam.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e08b391e---83573471491.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/tadosagekenalo.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/dukewowukixozibitodenolo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3c44d9b4---18744156921.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9rbo2ir38lml15i7qc2qdspr84/fiparadinujeradavokosumaz.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/lapevu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880556a1681---58433892736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=1+rupee+in+paisePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 17288 bytes
SHA-256: ab0489ec8d75e8f23f73bf7ed85f5aaecf224b9061f07cb9aedfb875d7d55952
font_01_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 18472 bytes
SHA-256: 69b8ea3aab7e34e6039db20143143effbb813a15248aa83c1b2498654fbd6272
font_02_sfnt_off000152f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B07 10036 bytes
SHA-256: 3203ae6cc53dd2bbe48d904f4add94cd5ed055ae58952e7ef6455a7ed72a2c7d