Malicious PDF — malware analysis report

Static analysis result for SHA-256 b889db1b99e79130…

MALICIOUS

PDF

88.6 KB Created: 2021-07-07 16:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2ecb4ad64e2bbc54d29ec6930240f2b SHA-1: 6f5eff340a52e7732030ea335eb12559d19f76f6 SHA-256: b889db1b99e7913062bb588709f35b64f5853a01f272ebd9665ade65b48752ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, specifically utilizing the 'formcraft' plugin's file upload functionality to host PDF files. This suggests a phishing or malware distribution campaign leveraging these compromised hosts as a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3a20b16e---minajuvezojero.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2900a52f34---27693052863.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/j53euak849u1qrbv52sdaa4l1m/36712821364.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096928c69041---20795017941.pdfIn PDF document text
    • https://megashina24.ru/files/files/9519373689.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d89161aae---28031903273.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a1b8f76509acac4cd46ef2c581b4d8e3/48997994958.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/logalujapujalowiwifunewuz.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ritewokegarasulonepanu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/rusulaparakovu.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/gudejokowapu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f846106c---zowetireku.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/paroxovasuki.pdfIn PDF document text
    • https://securitydm.com/slicice/file/8048948955.pdfIn PDF document text
    • https://wecareprogram.org/images/file/ririvutodibi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/psfk994hjo9s0gns9br9b8nrg0/78059856982.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3820667742---7573804494.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a38922bf---27183778602.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zupupojavixesufikela.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4995f8c4ebe7cb3c42ee78f749e57e66/72396174135.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f7117622---nadezomope.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/69746652938.pdfIn PDF document text
    • http://fotossc.pl/_files/file/69243140885.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16074575486175---43193616516.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/25714032117.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nqugin3p71tvc3bce0p21m8ri0/41271415238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=unseen+poetry+gcse+example+answersPDF 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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 16748 bytes
SHA-256: b2ae66ecfd8897373d79b70139f7baa36c4c7787ac98eb778e528c5dc9b1908e
font_02_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 10936 bytes
SHA-256: 17da0e87fd8430dbceec026eb569cf51613709c27ab08eceff05f9df92abd232