Malicious PDF — malware analysis report

Static analysis result for SHA-256 897d534a40946c68…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 20:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b877e30e181f1770b78949c468ef0e93 SHA-1: 5ff41d7399aba4c06e5725118c9717fec9bd1fa4 SHA-256: 897d534a40946c685fc441d8ef2ca7da1229654b54f2edc438dc0a1acba9a393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, several of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://loca-granderoue-montaletang.com/ckfinder/userfiles/files/21918449195.pdf In PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nakulasojunoxela.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/sovuvajisaboxowuje.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/kebitexedeget.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/bexalemogiperepuliwes.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/tatifafeselazesajixapufa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe9b39106---51756325956.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/3000577186.pdfIn PDF document text
    • http://firegallery.ru/img/upload/70017943682.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/33586729286.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8864291b---15893330766.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/radiwadawikazu.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/28938733973.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/pezivefaramifex.pdfIn PDF document text
    • https://windscrm.net/files/file/zubejofisibix.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/bobani.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139269803c19---24490636330.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/pifununu.pdfIn PDF document text
    • http://forti.in/userfiles/file/12774105966.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/46120801118.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/lefogexuduzigexem.pdfIn PDF document text
    • https://5udua.com/contents/files/62461401355.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/010901513510.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/55570699597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=12th+street+rag+ukulele+tab+pdfPDF 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_off0000bba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA9 18996 bytes
SHA-256: a73b05bf821a2b2eed8869d3087afb5b16178971166e607d882a247197b2f4f0
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10868 bytes
SHA-256: 86838c74304eb9236c24d7e3f9e8f9054149fed60e588a4b1db950a6ebe5fc84

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