Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7fc2449592d3e5…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 03:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5801a0fe4c0bd55ecb39172078243ec7 SHA-1: 8d50521b8186e18b7efd424113cb0dc6b4b89556 SHA-256: 4a7fc2449592d3e5c085f29ec693f5b068628c3191ea09be0f69c3f8e0227b2d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for SEO manipulation or to host malicious content. While no scripts were extracted, the structure and URL patterns suggest an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vrajacreation.com/uploaded_files/userfiles/files/xakuxanupajatamizati.pdf In PDF document text
    • https://otoform.com/upload/ckfinder/files/87479864219.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tunomasuxepi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ef485ac6a---zedififujewet.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/20393986171.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/67157606340.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/36795767545.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/74312739327.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/vubafizoleg.pdfIn PDF document text
    • http://apex-architect.ru/images/file/wotidufogajoluripadufobip.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kojukiwomos.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/tuwilegolipika.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/62485579208.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/83221027213.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/zonulegije.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/8527394671.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4f025af772da0c8375ede1168d02a212/39751216217.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/kofaxerulofilubazipol.pdfIn PDF document text
    • https://limmaginebistrot.com/file/womezew.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9700c7a5d---19927368388.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82be91117---fomuxujakakulolalufo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee05630b799e3378dd6dab32ebb91/59458529589.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/48582336054.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/21194008800.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/74290107966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cmos+4093+datasheet+pdfPDF 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 19360 bytes
SHA-256: f08eead8e4be64985aaaa84ab0c3f31022e2fe216b843d4abae1402b57f519d0
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 10992 bytes
SHA-256: 995b5f858398ccd9755b345b5cbfb2a2b10fc02c27285844dea6ac90f051f289

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