Malicious PDF — malware analysis report

Static analysis result for SHA-256 934c0629107006b9…

MALICIOUS

PDF

100.2 KB Created: 2021-06-30 18:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f14166051e6ee4618e6bed10eca168bf SHA-1: 61baed2318fdeb545132b37e5d51d876f316099b SHA-256: 934c0629107006b91b8e3210339da9bfbbabc5b2accf00ff7d4550d0e9e6e328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination and potentially leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://snotlicker.com/clients/10243/File/kolilepututi.pdf In PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/73448956197.pdfIn PDF document text
    • http://enricobarraco.com/files/kediziwoduka.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d4b25cccc0baa3d23518dc004b5ea8c9/12894847533.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210628_3818FD1C9AB34CA8.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lowifutelakodisemekukete.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/768a78a23a214e04af1ad2309fb6d231/wurenovugu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/7666869151.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f1059ccc---sidogixeni.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/dadf0bef9b57131c8c2774cf87af1695/tupabuwip.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/10179477798.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/bj9a927imo3n5jr8o9ecqub1ma/zirivizozanugusalimunasa.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/galabef.pdfIn PDF document text
    • https://chp-travel.ir/data/file/68446777007.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f70ba9d5---52006525433.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cd694aa---15923936589.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3gs1rdpkkcln4vq265dpheiod5/72340097643.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/20046379356.pdfIn PDF document text
    • http://azizolace.cz/images/file/zezupajaxukom.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/lekulomumosapozo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6731e13801075cf2b9ec533f4a1db792/30461248588.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2nbsh61j8g9e43kabd0q515pl1/94558566136.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3efb912631---gavawapobebujufonurufemut.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/javogukov.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4e5b16f0b1eb5f0b60753b9aa4df17d1/limoxolunubumug.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35dad3cd9---63497564291.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3dba664b2eb0a4fd433a5ab274c55b88/72528252075.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bbe3dcce654894d33d5546e9f99997ae/dutuzakibedigaxoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=phil+vickery+caramel+apple+crumblePDF 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_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 18300 bytes
SHA-256: fef0196b515df2152b3816732d0af0915e1528c03aebbbb36d2c2d1b7b98af76
font_02_sfnt_off00016b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B23 10660 bytes
SHA-256: 676c25f13ae39f914d20418989675a2447596bca5b13b9ffc9a5bd49b18e318a

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