Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d588342801aa9d3…

MALICIOUS

PDF

79.4 KB Created: 2021-07-13 16:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ad6cb4d20b1d396ee855444ad5be50fd SHA-1: e2cbda9ace60692757d3443e7a79ef1af20a1660 SHA-256: 7d588342801aa9d3bc4632c93dcb2981da4e47bcd245ed123d43ab62aa86f633
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs hosted on compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a22401b5c30---gorosakifimopite.pdf In PDF document text
    • http://kayapaliinsaat.net/file/pezuzabupetobudotadinugom.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/rogoriwujaworigu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e99a169bjfl7dp20m4i1d9cs5/vapilatajukupaw.pdfIn PDF document text
    • https://medtek.vn/storage/file/poxiv.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mifarirapuvuku.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d4cb2dd3---85609856030.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b2453f692ae---58847982084.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2cd9a22df---guxabivegupogebukosusi.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/xuxevo.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kv5bavre7hb9t8du0miduug0m2/romevenekufaxexer.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/238e03406841eb22abb286815f9bbbb8/87441339823.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/42655030875.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/12921338734.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27c9757f4788badd054ddb093b85aeca/nozelajuriwigitex.pdfIn PDF document text
    • http://nensi.si/upload/file/43731042767.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oqu2a3gpetcmupdhhcv7ov8b75/zetawinizuki.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/9996351515.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/5836483973.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ea3172158b0122119ffdf25edff906e2/96322852609.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744029e690f---49485429522.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8aa1b67ed5---30461608507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=spotted+marsh+frogPDF 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_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16904 bytes
SHA-256: c5f301f9f668e53ba37c2e99c59b9e3f73d51c340c540b0cc704def3a0d23e51
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 10776 bytes
SHA-256: 37a5aaa0b20024d87cf2b1045a36e8427e4c5aee5b84bb0b3f07f9849e98ed40

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