Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f85663840d22e8…

MALICIOUS

PDF

93.0 KB Created: 2021-09-15 19:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5b57abc4e2ed2bfef43d325df0e23ec SHA-1: 5451a28b728daec8a4ca53a4092980f647c959aa SHA-256: 10f85663840d22e82ac699f758048d0a4dbe6ac3f28506c48d77cf82e0628da9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=friends+with+benefits+movie+full+free PDF link annotation
    • http://domadoma.cz/userfiles/file/mixipuzotukenatorusi.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/61884919068.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/voroxi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d171ed7c60---41481867780.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/bedudumo.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/56532152475.pdfIn PDF document text
    • http://szcftz.com/upload/81469248820.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141840892614---89142303737.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/saratigel.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae7a34199---vejoxotukexizosad.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/bamasiloxote.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/sarofevatiki.pdfIn PDF document text
    • http://school15-tyumen.ru/f/disiritotuv.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/93635669482.pdfIn PDF document text
    • https://network-italia.com/file/88387566106.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/kafezaz.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/37086594032.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/35011132579.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/57683879919.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7b9a1c7---penaponof.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c28cfce7ef66491fc0e334acbece3e5/kakudosagupiraviw.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/rigosufososotekanefakob.pdfIn PDF document text
    • http://szm.hu/userfiles/file/1053745592.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82ae46ac3---xigejejazo.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_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10824 bytes
SHA-256: e17ab5f0ffee7a5accbc4549951066050ad42db67cef52d7242f1c2cb34dbace
font_01_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 19196 bytes
SHA-256: 3cac5a12add6509d1777c12e186e62f482d16991d9e20138107cf1051206360b
font_02_sfnt_off00014e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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