Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbf2510283081f6…

MALICIOUS

PDF

82.0 KB Created: 2021-08-28 22:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f2544dd180e9fa352d4f330e70e33214 SHA-1: 39ec93492f3795a17430f1b540910f1c776c3ab9 SHA-256: 4bbf2510283081f6f582113c72fb740f69d9379061ff98c63e0a788ef72b61ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=objective+summary+in+a+sentence PDF link annotation
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf456ea47a---dobakanusa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/10852635631.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/37274424599.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/12c8u5emdn3hlc1rg4o18s97mg/51781948394.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/bugin.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/tafutejimeniruw.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/silofe.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/tozobase.pdfIn PDF document text
    • http://prosquash.by/data/tujevi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fab30003d15---didilanifatupekibineri.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8baeba8a13b048f2dfb2e39f8a866a8c/57915124899.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/sevateranudikisutu.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0eaf52e602c2771bbb0f0d0ae6decd50/rutivotixodim.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gupufovotadoxo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/53a0842db61eebbd00465fab18500dcf/zapizizefakufadifewonaza.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/29160761109.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/xifefowotaguzagekixoliru.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee833c513---65121725214.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/domelobuvofunolusudetida.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kenesilinamoboselubibovad.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sikegotozexo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/bivil.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/tadenazuzamuwune.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 18656 bytes
SHA-256: e61401973e43bbea1e97b68a0b65d0cfa937297c443072e36bbd95833b11553c
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10800 bytes
SHA-256: 685c51ba8f22ac12f73af994096f2a3acc0005d9dbf64e189a2306d8b58e89d6
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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