Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d93bdbdb6a6dae…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 14:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27649f09dabbe18121332f8136816b34 SHA-1: f7d1856d378fbebffa35a4e9470cea4c00c44c00 SHA-256: c6d93bdbdb6a6dae325c1106848aaab1debb81132cfde4ba07d3db97cc961c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=structural+analysis+hibbeler+6th+edition+pdf PDF link annotation
    • https://dodatnagarancija.com/userfiles/file/54491714978.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210621062648.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/mowanom.pdfIn PDF document text
    • http://showdoimovel.com/files/files/61125700306.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd03fa4a328---53447285729.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf59aea40cdc3af67e6c7a48637b929d/gogatotasuvikikikiwekad.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/34926978534.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/liromulu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0fb3b18bd---purije.pdfIn PDF document text
    • http://teraval.cz/res/file/zezejevalabudar.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bnld2hb8huvhrdsj0gem2d21hg/77852480298.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/xifamudemalop.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/90329909291.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/riwaxopisitemolesexapasu.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/silobuxapiduser.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/detotig.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8sacumd154tc1o2g9srkfrn6n5/42299652619.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/26687388359.pdfIn PDF document text
    • https://stvorki.ru/files/file/40358150636.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adeff75faf5---gamozajugivup.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/79515829633.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86077cd462---71599646534.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a53bbba1---31950490778.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/vanimakurafazupa.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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 16564 bytes
SHA-256: c693d1b6c04f9b93d08d88069c11ac7a3189869e895eb555a83b82cb58910568
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 11312 bytes
SHA-256: bbc0c5d5f778c0502e926b3aeb9535c888e2007f5cbf6f6eea71e10dd78e7f63

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