Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5a8d0553881034…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 23:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98932d676423c52aa81985ee09f75f7f SHA-1: 56b474907103d7e1a3d0c29234607531495ef87c SHA-256: 0f5a8d0553881034918d74d1e8e378f857f041e52d308558a618411b52fbceac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nomylo.ru/uplcv?utm_term=a+tell+tale+heart+pdf PDF link annotation
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/nakosuno.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/40256518054.pdfIn PDF document text
    • https://kaparatt.com/images/File/bavumovoki.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6031adf3adbf233448507afe37eb75d/ripoxupizune.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/rawawemaxagiweso.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/52733161242.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/3986462979.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6jo8osu0scn7dc9jl7vnsq0ko3/27508440636.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210918032209.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd7fa4053---66915995585.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161303315a533c---fazedijazuwitaref.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/dakanomedutuwozujipev.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109070422427178.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/83078426943.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/rumunoni.pdfIn PDF document text
    • http://juha.be/_files/file/69522001096.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/93313232452.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8fb460444eeea7249a68a914c00038ee/nixotapewomotubisawi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d8b1e6cc---belujorevakuxojulo.pdfIn PDF document text
    • https://mytopics.it/uploads/file/bijabusuzegorolud.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/90500965946.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/xesumalukewuvozerini.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/mowememiwidopuwejo.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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 18076 bytes
SHA-256: c5a8f5ef2af76889f2ec5aa8cfb3f4717b76e901c93fbd867ca1b041e12877dc
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 10092 bytes
SHA-256: 5061c90b25faa7713a52155a6c090246b52d0d12b1306eb3bcf5c40eb4076d72

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