Malicious PDF — malware analysis report

Static analysis result for SHA-256 1929789d5baf5051…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 04:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 453cc2a463a78affb33762b9753a3671 SHA-1: ef0763944791d9210c3c8fdfbc762c1409c6649d SHA-256: 1929789d5baf505122a548599e43fdb3734c3cd86b844617bf95ebf0015da4e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. No scripts were extracted from this sample, but the presence of a link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f28745b762064151bf6cb9f99aaec288/noxexotasilafusis.pdf In PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/43d930a0727e98c189ad969b56118ac8/jiniganumatot.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/66689244248.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40a45e270---73923758166.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lewiraz.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d7242ca307fadd73fd5b89b7310a0fa/mixamiju.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/29291092733.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/84889073737.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tapawegomat.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d70bac1f10d9ede5d751a78b9b2020e5/64736039301.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5fd137e9eca9da53520dafd67bef309f/64849043918.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075783b5e316---691234723.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/qkgkrlj6bmi11u0omo4q800s27/53999735899.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/ziweboxofevomawugati.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/76163793264.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fc364cbaa657a3fde885dc8aba4f0f6a/wilafofexikixuku.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608149b39b46b---96552094372.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5718164a---77659776112.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/xuxomilefujaluner.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6564b8f1---xataxojujarap.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/98802275148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=oil+gas+industryPDF 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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 17084 bytes
SHA-256: 93932b9e7abb73a22c0ad2547446f6b822f1993651787059b5af4e2dd719f201
font_01_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 10412 bytes
SHA-256: af998f94898a239615f2f9583b721ee252ef604dae2225273cfab7440280248d
font_02_sfnt_off00013c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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