Malicious PDF — malware analysis report

Static analysis result for SHA-256 f669a5eeb91048d2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 00:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3e0b5215ca1b8441f3e04b86675774a SHA-1: c4c353fe22509e60f43296e14ebb2c2950b95cf8 SHA-256: f669a5eeb91048d23826dd30df0752afc831f21dc6edaf915150ca73a2ed4b32
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=signs+god+is+answering+your+prayers PDF link annotation
    • http://morard-mcf.fr/data/Files/24540592671.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/5134813474.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/s6dda3k17a339i2tnd1i9i7if6/81726873786.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608781be27dd3---55158453862.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6c65a0d7e323b531688853f2a7d94a2b/tojewosomumaxo.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/17751919.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210618/file/16239808008158.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/880475423.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tutulujisa.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/wolugezulifizig.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430b3c7bd9---71672522077.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/63bba3b8552871a158c8c606c8b235d2/57702834241.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/74653223583.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/75568469586.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/85990786747.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/tivapafuvefasamejelona.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/60650277065.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45280c915---suxuvudabelavatokowume.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mulof.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac42a9972---27579428036.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0654495001620631571.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609583f35074f---ruxumavutowumuludavazow.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 17160 bytes
SHA-256: bd930a4c99ba85b13bbdba4c84a88f7ee3d63ac396bdd295e029c093a00c7297
font_01_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 10800 bytes
SHA-256: 19941353d7195a6617194a1993fc0ea3f1df2f398d2804a19426937688d73dbe
font_02_sfnt_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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