Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91a721e10d3f8e7…

MALICIOUS

PDF

90.8 KB Created: 2021-08-02 09:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49530bbe8ef5b34656ca6850b77e6d21 SHA-1: 9b5382a755488ce0a2f3d3b2df0c15b0733505e2 SHA-256: c91a721e10d3f8e728e1f728597739f21e7819d64f6a440c421eefad1d76e404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or scam campaign. The presence of a UTM term in one of the URLs further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://inwebjor.ru/uplcv?utm_term=how+to+set+up+my+amazon+fire+stick+account PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/632848a2813c524229e8b8ab4c8dfa78/32119854880.pdfIn PDF document text
    • http://attlas.center/userfiles/file/74673325500.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805da64d028---70465014547.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e5cba0f63f517c01e3f7a24e8e6b6779/63206991132.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kamopo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/12aeebbad6adc17a4ae8576ddf2fd60f/botupubugupaduzemugene.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/eki0hfc9j0p9sbehj6ft7rp1bj/dokasopoxa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hbfnipat6kc52103k29e3fhn06/lokinabinafaxataxerimigel.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/20065696254.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/50512469091.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/jifusirosurixesug.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bdd5a3aee---zakajadamosuzuwop.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051414570464.pdfIn PDF document text
    • http://cosyromania.com/media/file/19313603547.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/77187733055.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/rifegilewepuleliwosuviwag.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160703527d10f8---jalupawuvoxasuzokefezi.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1bddd85e7977d20230c0829bae8bcd84/nimuzededonodira.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/icdjs1msc2anbnnr2ugqnlg4di/63481975808.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/jerimif.pdfIn PDF document text
    • http://zaiger.ru/img/file/kazulife.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/purakiwabupobivezuzebi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210626193701686.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///degiw.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cd09929ed0b9577427a15f2fc7eb86e5/runuj.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_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 11040 bytes
SHA-256: 3adae1257b69e8877b4ffcc4c9a28bcbfb15296cf37005f03c5761f3b11023b8
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16996 bytes
SHA-256: ae9717017f4e2b1d5877692f43704f664f3af07702caee8b723d9460b0d62bad

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