Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd1e18a6eb24d33…

MALICIOUS

PDF

155.9 KB Created: 2021-07-03 20:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bdda446530775de23ae82d7dfca43498 SHA-1: 1703f8589f83d3bb76dab90bb19865dca7d71f4c SHA-256: fbd1e18a6eb24d33d7317dea61a5d5aeebc6e6b8103bc798b978a7d5fea7a326
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient to infer a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 http://billedbutikken.dk/articlefiles/file/jibiguzuzemugiloxagabal.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc527128fe---54511108948.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/ab250216ec2aa2df1590117b4a94edeb/jakabafowumuwebebamutu.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/manipufewirapo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ab1a6948e18713cc194939acec909573/17516991178.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/41464418258.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wowakidiminujisel.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608544c31991d---85527856613.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/65072143950.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/97078952167.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ec5a2f5d---tomiduvogofe.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160711a026ab8e---suvabodiwobove.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160866350a5593---telunisujinobamadujeb.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/47387827307.pdfIn PDF document text
    • http://mamam.by/upload/File/file/25857616075.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/840396053dab56cded3f46e9d57a3a1d/50320473054.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073631e03f01---sojavefukajawenegazetibis.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/gawijawuguxijutegugawaju.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994bf1079a---jalogazonobuzumurolofigub.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098983f84f41---182895801.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/78283686361.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0eb62384---wozilo.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/90350355240.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba16ac3bdc---86655456927.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vozabozi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bumadirakosijanizejeguna.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/zizaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=effective+methods+of+teaching+history+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_off0001faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAA9 20316 bytes
SHA-256: 51ba1f558d4c022aaafc1324d0e72d829b91c2c42ce4eae002bd4a6fd4cdc796
font_01_sfnt_off00022df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DF8 11184 bytes
SHA-256: 916092e06febf3df2afd2c2a90175e34cfbba5c4c220e1db13a207e42e17c937
font_02_sfnt_off000247cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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