Malicious PDF — malware analysis report

Static analysis result for SHA-256 81913096e1dc5774…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 15:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a08505a2305983febe79de69574fe1fd SHA-1: 48d8dd03e4412fa3a9637c633d12cbe905ea6b23 SHA-256: 81913096e1dc5774d75d9e62252791a7e4cb89c415940b1024238dff595b0e41
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://china-shengbang.com/upload_fck/file/2021-9-20/20210920203007223908.pdf In PDF document text
    • http://awarelaxcentrum.cz/user_files/file/76627492468.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/43226991688.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/90455076313.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/70008702151.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/perijune.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/98495132106.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/kamaxedo.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/negeg.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6591163076.pdfIn PDF document text
    • http://ipceurope.com/assets/file/21424086398.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09a656aad---tizizuwebaveruli.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/64925680098.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xewazedikulinururigufon.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613368a794046---wopitarifotejon.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/zogorerafisesanapader.pdfIn PDF document text
    • http://yuli-china.ru/d/files/siderawubututes.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613379937dd83---xobanowopawekumozawi.pdfIn PDF document text
    • http://aa-nusd.jp/81130123197.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d3d0a9712---deladexogale.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394e650e463---kabolivotemitubajofebejej.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/nagerujumugowazaboxopavu.pdfIn PDF document text
    • https://yifff.se/userfiles/file/39407343794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+tell+if+my+iphone+is+blocked+by+androidPDF 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 11308 bytes
SHA-256: 2bab6a36b6bd91fb35ab93c8a860e34b6b80e943896565e8e048fe46e4f80deb
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 18036 bytes
SHA-256: e811bad7531ca6ee4169b40efddc0c21fff724d3880ddbefd74f2136721b5bfd

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