Malicious PDF — malware analysis report

Static analysis result for SHA-256 10db60790102ba4f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c88407bab0eb15d34ffe199173350a71 SHA-1: bb32cc97e02aabc0f4ab84320c1683ab22f10385 SHA-256: 10db60790102ba4fb7392803fb3a96e834a5c9f44a56bb12727f0eddca9c6a7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic firings indicate a high likelihood of malicious intent, specifically related to phishing and the use of compromised CMS uploads for hosting malicious content. No scripts were extracted, but the structure and URL patterns are strongly indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f01b662ac---meratulipef.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/pabojivekibarise.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80738307166.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tolojajaxa.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/kadigamewuxomavovufemumus.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f3238191e---denaku.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/watobifavosa.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/nejisisagutawapawixizak.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/69340030473.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c8940f36---43345341879.pdfIn PDF document text
    • https://profm.hu/files/file/36834673867.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/tevuza.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5649db3081---7483054694.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5143d64b5---kobupubivino.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/falipoxawituxexijusirunu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c3767a2657502de982ad83b6ee723026/zalevilerapa.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/68985215.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/91481120734.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b6a0b28d935a8052049980de2b76dfb0/silumubeditujog.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612094f1f0e8e---rebomikulupox.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/73908217087.pdfIn PDF document text
    • http://suara.ru/img/file/jibinapumodek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=job+solution+book+pdf+downloadPDF 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_off0000be11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 10668 bytes
SHA-256: 609270feba2dbfa7fd026d0f6c0a12361e8fcefee324d1c56a0bdee81c72aa72
font_02_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 19400 bytes
SHA-256: 71655e97bb1eee7030d9c1ef56dfb36c8fb744d42a1afa1f61599339b3d641aa