Malicious PDF — malware analysis report

Static analysis result for SHA-256 7308b0bbf7175fd9…

MALICIOUS

PDF

82.6 KB Created: 2021-08-19 04:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e342e88a7568ff8bc66992916b292ef9 SHA-1: 78bda8d426747f665dc0fc34ca71b2d100e5e757 SHA-256: 7308b0bbf7175fd97e485871b0ea67f175ec9d0df7b5294fb7ba0e826fa7fef9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://www.petersonassoc.com/emailimages/file/bixevidurononaruf.pdf In PDF document text
    • http://sns.hu/_user/file/26735186118.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b56884ee---28292975122.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81da21ad8---82796787027.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/9145384432.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0ae313bbeca40868ee2e5dd2b6e14d31/75706380687.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/61a8d6657f2cbadc5da7b9b0e5dee19f/wobasasadusi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ae86e9fb876b112740612d8b40bcdf18.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/sowow.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wiguxepirepugafenuvidewa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/af3db069a94be0d8efce61606d534a77/72038958500.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/37051518612.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/zaxalunawabalike.pdfIn PDF document text
    • http://prota.ru/upload/files/96417146879.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/sutipolutasav.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/zutir.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zeneviwud.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/zivaposopilena.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67c8bfe53---perowolekoforijamotikated.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/77788352231.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5545c8da3abfb6c8bd9b55c354b56f48/17167871740.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/lopezadunaxugipemugemulej.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106290838436351.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/biguxelorinafa.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/23590773297.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/warixafasumajezafezukuwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=five+nights+at+freddy%27s+4+mod+apk+free+downloadPDF link annotation
    • 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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 19728 bytes
SHA-256: c0e6796c2dbac65c2ee7602c5e6189de2d1b72e69b83f790bc1565a8d0bc21db
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 11392 bytes
SHA-256: 647d586e57e92e35db5ad624d9a8e5fa89ea55d33f999492896d993630a1cafe

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