Malicious PDF — malware analysis report

Static analysis result for SHA-256 d777a1cdb9a34ff7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 05:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c01d0106e3aa5563f6e0717c1f658a4 SHA-1: 14a4d65467c1c540a34883b667d3851fab5b967a SHA-256: d777a1cdb9a34ff7b11c89fc95dfa80d0f428d87d18aff6042229170509f8e4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://ketchas.ru/uplcv?utm_term=scanner+epson+v370+pdf PDF link annotation
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/buwowerawip.pdfIn PDF document text
    • https://soechi.id/userfiles/file/gakinugazofigeme.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/gedaziduzipi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611de57fd096a---sizawetubosebolat.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/57673221103.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/13400572667.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c86aee6a35c---20292187957.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3714e066151816441009026c9bcc75/jagewigunalorobu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/91obphun00gje63via7dj5i66c/logijaneporexavotoro.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/63183293562.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/tipugasepegivowewariw.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5hvpmlp5d8i52qcnap7j8slv00/zasogazewapojezada.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/86450361894.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bdh1gc79j6le46s1th6dl19qb1/wuragaven.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/60062785031.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/88371954925.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gtvtd2ea0ln7ur897odoeri610/tumamikapajasuxone.pdfIn PDF document text
    • http://teplospectr.ru/images/files/52965049552.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac232e8225---lomivi.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/katolox.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f82ebc22---6827065383.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/33467940056.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/50533249143.pdfIn PDF document text
    • http://446888.top/userfiles/file/20663985431.pdfIn PDF document text
    • http://ativn.com/upload/file/wurinavede.pdfIn PDF document text
    • 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_off0000b61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 10860 bytes
SHA-256: c7245b5c71530351b6c8ce650b233a1095e563ec81498febbeff0a3b3608e30e
font_01_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 15292 bytes
SHA-256: a2cedec5649736296931b47de6b649ba030eaa72cac3765eb81eded7c8bd3897
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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