Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9808473a33a9233…

MALICIOUS

PDF

91.4 KB Created: 2021-08-01 20:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5c61aa8dde93f5b533c213e53e00c00 SHA-1: 2ea1a4b616e08ce1be8cdef652f08767e4d46b93 SHA-256: d9808473a33a923304043c588854fd815d715b54c41fbb0f1a445636e78ebf5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, indicating a link farm or phishing lure. The document's structure and URL patterns suggest it is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a613de6925---xatoxapusewezeluvez.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25f5a23b3---sedavuw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ftgsudtit1fn6br8mj6dm5ud6f/14483873330.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/74921572656.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/wozivexixopafilaxidubeg.pdfIn PDF document text
    • http://bibonatura.hu/ckfinder/userfiles/files/86097479976.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1a9c030935f744f80385c18982a961bc/13846863480.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7314b6298---nutiximolu.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/sojaf.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/99980681498.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/42c9c4f93631877dc554ff368da9a376/3965730436.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/35251949713.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kijug.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093de9730d8d---xipinetatagupezaboz.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tvt4v7smv18f3rlh5ev8r6a7q4/riponixiw.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/nelizedarunawebimakapozul.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2a78cd073f6fb94cd7c57f5f5ddfc7a0/kejifuvawajuk.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/pilimekirejuvi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rigikamozufi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tejutodutubikow.pdfIn PDF document text
    • http://btfa.tw/upload/files/jugarezazanaderutel.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/87275390468.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8399d6959c---43234667387.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/60230533418.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608152cd2733a---44865363025.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d970a0e2---lotaxexokunejojefer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+fatten+up+a+broiler+chickenPDF 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_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 10816 bytes
SHA-256: a9839d6583fb54b69254c40b965d82f19f4ae561d308ae8179d179be3684387b
font_01_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 17300 bytes
SHA-256: 274adc0e08b805f6e51fede4f3a524a0ff112649d01906cacf21598f49214784