Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1ec9052fe63478…

MALICIOUS

PDF

77.8 KB Created: 2021-06-25 17:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bc8f29a4adf24c299dcf7c326cbbe15 SHA-1: afeec74854a5fd1f4a4d57b388f83bd20fe67572 SHA-256: 6b1ec9052fe63478bf105a35bd1c55d9e318d4d8e447b7dc05ecc3b25b5a363b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://abe-rdc.com/userfiles/file/12225838759.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f81400a9a---muzesi.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a088d172---37026712258.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bcb91c081---58746149976.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a306704684b---ginir.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5e167c71e2661feb692bd81056b1361e/70934877079.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abd779708dc---80603372159.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da61bf5bc---tifol.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037605076a---wuwitibotudo.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/efacc400cc27756ecebeee1f8e615f12/voxitulaxobudu.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/wexofusetezewesikupu.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2eb2e19b7b07528a906089a4420b7f77/bifezot.pdf
    • http://zubrcup.by/files/files/vuzose.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eb98v5kp22hu7k2b0e6i0oihi1/14259553167.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/13pqgmg49f1qpb5dasgvi98i53/91019671128.pdf
    • http://moreit.ch/productinfo/file/83757193550.pdf
    • https://acryl-bg.com/userfiles/file/falarovivej.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5ab061b4---zibativi.pdf
    • https://dienlanhhonganh.com/images/pic/file/tumejedulisafixe.pdf
    • http://straub-online.ch/userfiles/files/69167801575.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/469de7bd6040cea2bd536596693889ab/jowajesepalu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879124d76a1---60240832866.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a156bb4cdf79c3ce091187bf41c74e3c/ridusijejudovafidaniw.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5cb1ae637---gefunidav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=autowired+with+constructor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 16792 bytes
font_01_sfnt_off0000e400.bin
10f6e17f8dfd0e6c79cad9a8bfa4e0c843f662fd75f098eb89302134a53b32c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10424 bytes
font_02_sfnt_off0000fbac.bin
3ff68b03ce8c252cc1caccb0a4b56a3b700946d388ab3a7dd3874cead34584c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 17616 bytes