Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26a2c965c88d8c6…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 18:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dda08b48ada41fc0d13c63b49cce78b8 SHA-1: 22f3b34f1d82bbc5be02c5532fa2d5cfa3f0499a SHA-256: d26a2c965c88d8c646e2e3790dac1a7ed6d1ab6321e2e7ad19a5dd5de829ee92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miele-service-center.ru/uploads/files/jidupidedowujowika.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3863fdbe1661957f4d9e344d8caf9c14/bekasevuj.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/keloverawe.pdfIn PDF document text
    • https://norservis.cz/files/files/pibisebabavarevotiwita.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/41982249965.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/fawatobawupugowuvaf.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8b50h416okdurh2ebv927t0998/94765089708.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/74184811301.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/neriz.pdfIn PDF document text
    • http://geasit.it/userfiles/files/70238871066.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/81297322942.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/vozetakadizimip.pdfIn PDF document text
    • http://secretinvitation.net/images/files/83882467207.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/radisanexapatavuwatejobuv.pdfIn PDF document text
    • https://rintrans.com/files/44666854247.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079cac00d221---12377528840.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/82852521641.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/12692367544.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/84171861863.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/56299ecfc444701646f6e286d6e21cb8/nuwobojug.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/sazafasurutavar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=phonics+al+words+worksheetsPDF 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_off0000c302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 17312 bytes
SHA-256: 3ebc536807868a80f32565ff82ec02b5e2a5e95efca89a3e70b03fb0b076dc78
font_02_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10644 bytes
SHA-256: 3259f7d466b5c5e1dff6264904426b582a60fb7304256bd18a17a022f0d78c24