Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db6752e857abdfd…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 14:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0bec91878badd88b8d77b81a74bb0e05 SHA-1: df60a532e8f43e794010dd87fbec08259876f4bf SHA-256: 6db6752e857abdfdb93821e614ac545f8b6a68bc72aa955e3c2dd9d9217eee3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple PDF link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2424c2a7---dutina.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nenitiwowum.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/sinif.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/maneluzugefuj.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/42b27ebfb3c63c3a53e827a08a586546/pelefepuzekunil.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16241195078613.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/79082782585.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf56e2a6d---3825136696.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/tozinibujebekovojojopelej.pdfIn PDF document text
    • http://teraval.cz/res/file/wosoxawogezazug.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9f88af75abc01c184f7b39ac90012438/lesupoketexet.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/41830528635.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/lepugalakukowu.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/pavumorivawu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a716829d7---70171881242.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8db27808---605605679.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082857db9512---20090251707.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/sibiwikatu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/97b7c6cc44692c29b1c861873c8da3ed/58417609295.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/sbn7uinajuij320qe7h4vsv08b/5473243076.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafd976d19---60564254714.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7af6305c0e3dddac0013345bed81ea8a/67848057312.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kef0mp3gmt7nbsu4tqaa9m6m2h/difidaxovobelesadikifur.pdfIn PDF document text
    • http://dnepropress.net/files/file/keboma.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/nunimelemabaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=inflation+through+the+yearsPDF 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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17868 bytes
SHA-256: 678977f124447c0c8f3251dec9bb0ce0e1bc3971b0efbd86c7bfa12a8eecd1a2
font_01_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 10656 bytes
SHA-256: 0e1a2ba4ac5ee093c8f2dbbc8d82c7168614b54c2bea9cc3e8dff8eedd04d595
font_02_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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