Malicious PDF — malware analysis report

Static analysis result for SHA-256 748a2080f66dac49…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b8610f6cbbebad365806262dbd770d7 SHA-1: 6590aa3967ee1f22db4f23a083938a7ee3b1679a SHA-256: 748a2080f66dac4966b6fb2377dbe5bb5dd890ac31882340ab4756b4618ae93f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a9ca9c93f9ccc01f0b556b46c9d50fd/fawanuxilezudemejag.pdf In PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vugupinewabogupuf.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/31e61116aab21a488f162fe0c4e129c1/6457921252.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bee2e3357---59089793887.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/74540766197.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/42092630282.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/pujuvekunaj.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/teradaxaxo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c3c5e3da1de778519118a1722083c741/sixapulunurivun.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e0f6c84b---10073917584.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/jls9tm01vplvipuuvsuqorsumn/kimijubobikor.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/85667073314.pdfIn PDF document text
    • https://davaocarrental.com/images/file/31270812984.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xojirorobu.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/74450194732.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/kudefamodig.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/momubekomovi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c0ac2d9a---10273197940.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/51152407765.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c78420ac9---zexigigutij.pdfIn PDF document text
    • http://darstin.com/userfiles/files/3594303272.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/32707058002.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/wuwitupebowatevadewugex.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/73461574963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lab+glassware+names+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_off0000bd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD28 17708 bytes
SHA-256: 092664e01f9ff0c9c271c28b6b04d4ead7e60363684b41325be91e4471a7bf16
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10716 bytes
SHA-256: 71d98947d6bbd952deff1245b9d6cae800a93ec497749d9c684247735791576f