Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d815db8193181b5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 07:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac76ea5b414f6ffbfa044d8aefe8d059 SHA-1: 109764a8f1e4acba6781b0150deda02e922a109c SHA-256: 5d815db8193181b599f24526a04e7c4d5bd0c97c5c33abe0cf158ed87cd2b3dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kraski-chernila.ru/resources/file/33625003090.pdf In PDF document text
    • http://bienbao.net/uploads/files/xujiboxerodizi.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/vuzora.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/papurububosotozad.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fowesidimasefaluko.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/wiwabowalujelerofawetevox.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072923661d06---dirowarivitokiwor.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/jajamijidifovotu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd413a9818d---doromadavavuxav.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/28115338355.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/59700013919.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tulinadovunilatekajekipol.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/lizamimanexutibis.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41fb64921---61135562843.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/5690124622.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/gaxagovijumikatuxuxaw.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/83702870741.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/85870593707.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/tipokunoreni.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ec2e6b82---83259378546.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/55120291727.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/jatuxilipibeno.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/teborupivamijaxozalij.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a10826f1f---rujivolukudet.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/5101236715.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/84216780799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cs+higher+tier+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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 17128 bytes
SHA-256: ebf1509636e32762b0048b2113589af0bb8e3cd2b14ef03bbfaccf86973cb064
font_02_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 10564 bytes
SHA-256: 490f5c234db5896895993cd02f4d2099304e4438b6d5b66e7fa783f2c07531c6

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