Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48e922681727565…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 16:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8004a09e83ab3f506334185019a7499 SHA-1: b0c9da7837412ce77606f44b7966d0d6175d3462 SHA-256: a48e92268172756591595bbc488a8780884be7efca266e1bf8d5b419dbdd8d75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=red+rhino+5000+manual PDF link annotation
    • http://fence-alarm.com/userfiles/files/96885111798.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/11377921936.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3aavalro9a9k7phglgsf9svr07/ximifoxudotowixigeguvito.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2aaf787ceb5f89cd2c4b6a872aa9cca/buvoxazu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/zilapemo.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108230753332349.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/dareziwegasomujazukuzizab.pdfIn PDF document text
    • https://jetaime-shop.com/files/pimax.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/vegawofaluwebesa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e63a7645---ladezeni.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/vadufujususapukaj.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077782872f9a---64418338460.pdfIn PDF document text
    • https://12waktu.com/contents//files/44312960508.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/mikexutowumosolinuxewegol.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/44357158091.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/rawuwuwuz.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/09fda021783d3bfcdd5ae0c1e2f4971e/sitejo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6af9qv83t5qprsu75st9i7hu62/66635625323.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/61751815629.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/43549395767.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/40f5trae1kjm5ih6pjdpo7g92a/34363903294.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6np87jgmrapj41uvgdi36kqrp4/36347024008.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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10648 bytes
SHA-256: 1532b1e4bd9d6f45392fe2f13ef6c7fd965c9e166b548d81c8c271be036b427d
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 17780 bytes
SHA-256: 095a173013e27a3ec92321b04c046d02653ad5805e045fce4f97afd2f3b42459
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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