Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d364b084f631fc6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 01:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e842c9f2733e21d99c2313e561d6136e SHA-1: d7f15b308ea1771d96fc5e0da41df622959d16ed SHA-256: 9d364b084f631fc65c46f02689b7d918296ae9c29f10cdd26be19151a5ad1a13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are structured as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa35b09638---revid.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/tosofujurinurofifu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/fejesesadojibimal.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/midote.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xozapiku.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0e6cb06dc---77962061107.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ef085ea92---24315397222.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/28278745913.pdfIn PDF document text
    • https://sanagustin.cl/files/32594079119.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee32dc44ce8---28802443009.pdfIn PDF document text
    • http://fitviewer.biz/files/file/xegevona.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/kudabowuwaki.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086240c77648---jerixisurajifav.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/zanevowoxu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e6378jgdft0ln9bfu5bgkjnut7/81907934948.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/junilox.pdfIn PDF document text
    • http://computerdoki.hu/user/file/90729294757.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96e1e4b53---25197929797.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pajoj.pdfIn PDF document text
    • https://digireg.it/upload/xevobixetitin.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/17616164614.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210803_015244.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/juvulujogagezakexuje.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/53478252142.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/55254214661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=taylorcraft+bc12d+service+manualPDF 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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 16308 bytes
SHA-256: 39ff94240639580de2a26eb271d69a54d96cab37003ac5b3226d97c604bf4f1f
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 11192 bytes
SHA-256: 1cccbe0a1744a395f1a0625f2d7e47b88fe7aa046c937ac39e0b71f980a1d341
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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