Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b917ee7395643cd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 19:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 347a7216792ef6bd90dfe7afb123ebf1 SHA-1: 9857536d979d507f92889a83c2e4c738130ad79c SHA-256: 7b917ee7395643cd9d7f12195c3ca63aa0ae1908f21f961dd8f160152d9a5a5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://mttrasportisrl.it/dati/upload/file/vixeje.pdf In PDF document text
    • https://maconlux.ovh/userfiles/files/kezixelaxo.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/80162997813.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/pusaledigosibo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161357c567d393---xozumenix.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15973853221.pdfIn PDF document text
    • https://aayams.com/userfiles/file/janakoxexal.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/simiwet.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/29151758271.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/1390252648.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/22464925442.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/tuwof.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ou5920lnmmftpfetfanb9gjgd2/51209097402.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/20164710679.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/rudowi.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/76459100521.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/33784054815.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/bukatiwokomikevewo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/15293d004d3f2450d17229b42b2c9d91/fuzalobotem.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/gozasimebepukagilupere.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/fujopatijilujirofutepo.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109011254526150.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/18938779812.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/pakujoxapopizisewuzos.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/folepiderenod.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/50979848462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=descargar+widgets+para+android+gratisPDF 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_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10732 bytes
SHA-256: 03e7e61511c726d4832f448a40b8203dcfff703d854395e1868e5813944e4536
font_02_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 16976 bytes
SHA-256: 0858416f9226c6be9870d3892152b085ab0041ec47a18530f06eaf2936764028