Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b97e1886ece71ef…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 04:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9930c818f59e250666898e92ee17b102 SHA-1: 750df1059608bee8e8a12e63021e1e89d1b1aea1 SHA-256: 6b97e1886ece71ef20f1ef1b5cb564286672b2bb5b6110ce6ca77fc5c1543090
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage these platforms for malicious distribution or SEO manipulation. The ML classifier strongly indicates malicious intent, and the presence of multiple external links points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=green+goblin%27s+last+stand PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/91611440247.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f85a0ac883---kuxax.pdfIn PDF document text
    • http://iphysiology.ru/upload/derajusikekudorunagevun.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210626135740_o9ezcg.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/13747789213.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609659948eb45---tituxapanu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8f5dd22c---vodigisuxuvejoraxubefe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b51324d3---somobetupebuganexime.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1bdebf32db41da93cf64fd1259333509/gexenogovewe.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xatudoxaditefemobitejebuj.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ba78e372---wurobineserafonotaw.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/81c8f050b34c7db3bc2c208eea9b4dfc/zeginebaberenajuzeka.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/aead66ace0a764a8436de920a2a1c6f6/24967154075.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e0673654ace3ed6342cbb48c20452a6/41856643071.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/08e3c86772339110b5f0b64261da9803/daxija.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/6695501116.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/mutaxexuguranufosuniru.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/siwawiwotikumo.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/rijosesawutifokesama.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/abd87f82c6d8413f82e5c1cf730b7a07/22002288321.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/10943186214.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/24071954630.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/vukenixepavuzisele.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_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 18784 bytes
SHA-256: c494ebd571f429bbb9b1be23ec67889024c5a87ece1bb462f31d7317ede61065
font_02_sfnt_off00013f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F19 10636 bytes
SHA-256: adcbfb5295d2b5b350a5a51014904758f10a98dafa8f4e1485ea14ef8a7320eb

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