Malicious PDF — malware analysis report

Static analysis result for SHA-256 6420da44ae9c9148…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 12:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2f607ee5b1839d6d4976241dffd7bee SHA-1: 3151ca3a12e3688671e3c9f36531fc485eff7a99 SHA-256: 6420da44ae9c914824b796a7d79397cd47668f12bb63d0842537357df0e28add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or compromised upload storage, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=how+to+off+the+talkback PDF link annotation
    • http://sterenstein.ru/userfiles/file/24163607144.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/53pt0iruchb8h62v4hvcpsene1/pufoketitugidezexalexej.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/41557848822.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/lukorutilulatex.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/toxugojonenixi.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jenetajubeza.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/kudorora.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/xikajutazivorarajogojazo.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/posaxadibirefixoritevofi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614061c9d6065---1170706708.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/witive.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/36638996858.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///moreji.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/52500986882.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/juweruvivoxiromurar.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/26583936562.pdfIn PDF document text
    • http://apsons.eu/files/file/bokatemebimoxorukagelob.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/lorexodafizez.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907003004766664.pdfIn PDF document text
    • http://samtekelektrik.com/files/javodoxobafagusiwif.pdfIn PDF document text
    • https://bdata.vn/upload/files/juxemiguwimozezumosipapaf.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/7123755125.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pjms99vnnepqba0umpac6b9785/fiwisekidefop.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f521cc43d---nemogubobulawavugimasubof.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/zogafufiw.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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 10280 bytes
SHA-256: 61103419bbc20fbb9939bfeb6351b53df2d840cf272e4e5f80d5313b32fb2343
font_01_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16764 bytes
SHA-256: f7277a1b84111301bbc130062ba54a23f222a44e7c9e3c030e9e0bd9a49ee3dd

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