Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca83f658c954ae0…

MALICIOUS

PDF

90.2 KB Created: 2021-07-01 15:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90079a99a5adaece0888c41d24b51114 SHA-1: c31983b28198358ba34146f1535dc21c6c2db7aa SHA-256: 2ca83f658c954ae095f420f069cc81b988d43a984e381b4fb39aa83e3c0e429f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=easter+egg+quotes+funny PDF link annotation
    • http://www.bandungmesin.com/file/mipetezaf.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fimupudotegabetelaxezana.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/de6834da856d2ea83139c3abc3783782/pomujavivakogu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wuluxavupelopikum.pdfIn PDF document text
    • http://wami.cc/data/files/99040182847.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/69942113754.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d0529db9511a0e431eaad78782ddea26/68244308481.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/stdlj1p8q9sbirg84a01eg8jv7/gevomet.pdfIn PDF document text
    • http://midel.me/userfiles/file/67136970504.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7a13d3dde54f1835437c4cd65470f816/40893237773.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e3e938f1d26bebe0d7104b2fe0fddb26/vufenazizikas.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/90740715289.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vipob.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vaxer.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a943b94e4---gavozasasimutem.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/12741c62c36bffa724b96eb35c6748c2/17725191658.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5ca0e9the5n2eikmojd6pa5mr8/zuwokijuwosiz.pdfIn PDF document text
    • https://renault-service.com/userfiles/94773772674.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/27268847946.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebd0bbae18971382cda72e736b7f6f28/70301847209.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/dfi871vuofibgeacruc1igqsn5/32654558050.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/kipunanomux.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90481960823.pdfIn PDF document text
    • 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_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10592 bytes
SHA-256: c39097e070683e581cacb1e426710b5ce9011b5b6e9c65eef1645a59c946ce64
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 17672 bytes
SHA-256: 9bc3a7d09253c0f8507414e4cf9a6e92d4cbeb7c810709526bcfce4505b67401
font_02_sfnt_off000143a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.