Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0b1de5c8b8068e…

MALICIOUS

PDF

102.8 KB Created: 2021-07-24 14:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad21a1608dcf573bd7fb4ac54f4da804 SHA-1: 94e81ea5a8d931ab27e24f2813e1bade07c843ea SHA-256: db0b1de5c8b8068e18b0dbde848056d46c2efca7469bfee31fda3468ff9125f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e667b367---1663912979.pdf In PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1lqn0kn9gg8lshc6ehep1jm4l8/bifewagapawabeb.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/etjko9lus23lj9v0rjtocdrdis/53397386498.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/vojumajatesu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/281cebc6b760e69e378ff4fe513f5f34/37636075515.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/11dc4964184e808a06c73772d753a5be/48153676556.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/uedl59ptt3u40khgsip3ja47a4/25725638363.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ea654fdfb1df9985828cb818ccf98b6c/vaniwitimojib.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91f770657---wovogu.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/34403432147.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/94110787188.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfa80684a4---49422975045.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/56117844082.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e410e4ca4---15884942108.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/pisarofez.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c99e33dc3---wedajusowusutamiwaza.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dipikogamojemigigir.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db0694984ab304a1d5e11147e603a50/28934238546.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908ef0104c1---nisazuzadepupabininudo.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pomuwizokajevidanuvolof.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/gefokodariwigilubisosedon.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/rakufapem.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/wawerixemuzojoluninu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/71654085149.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/48630583583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=employee+attendance+monitoring+system+thesis+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_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 11164 bytes
SHA-256: 418cc03d9a18ffc908605469a5173a9d90ba2fcd582473f62a9c6c3e855e41ac
font_01_sfnt_off00014786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14786 17256 bytes
SHA-256: c1926934b6c336f21f47387a68e9400bcf718e41ac0c083caa9f387571aeb8a4
font_02_sfnt_off00017449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1