Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b4a5ce06549a09…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 19:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0ab92b848c61543d9b1938b20183c3d SHA-1: 738d8c889a5f2eb7b08fc8cb28566133ef7f9af1 SHA-256: 59b4a5ce06549a096ad409f6f9d0418993fe9c788bf10145cb6d441f557733a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to various domains, some of which are identified as compromised WordPress upload storage. The document body is unreadable, but the heuristics suggest the primary purpose is to redirect users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=how+to+turn+android+emojis+into+iphone+emojis PDF link annotation
    • https://fundoohairstyles.com/hairstyler/images/file/88748932776.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/86542373722.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1b82811188f225df87cc078fe0a9f815/gujojiwewavep.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/49796764088.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/m6j7q8udo78vgp1o438d78l48o/68180388115.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/1564911209.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xivinukadebow.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/vusirekuzemumukuvir.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/84539653394.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b453fed7641f26579adf833c28198b67/wubetemisuwawomozu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae1bb0fa6---9696582385.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/dibulusavinuxofiju.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/nozimepazoves.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/fozaku.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/24658554002.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614071026184d---lubukukilubope.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/53870267956.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d82a9dfc---muminurub.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/87935009331.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bcb7eee---18861094526.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/16837043370.pdfIn PDF document text
    • https://salwangurugram.com/files/75237222103.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcab11970---wisoz.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_off0000bbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC0 18456 bytes
SHA-256: 2a82bab6417d6352eda63f653982ee30e7534b22e07c283f3456743b357c17bc
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10920 bytes
SHA-256: f42ba707bb943a72419ad833658604c603aa489ab99f5bf60289ea1dcc3698f8
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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