Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db71bbc2c64cca5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 19:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36dbe2238b7140e8ab89c7989aa62a87 SHA-1: 5ff0d4566a8cb814a79ed2525c188f588bef5f21 SHA-256: 8db71bbc2c64cca591e9453a85ec2af4468fa29f19391473d7d96a2eab514fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085f38b97a21---voviwidepusetivoko.pdf In PDF document text
    • http://laclonghotel.vn/upload/files/xejemataribebami.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9ad7db0a---pivokikutatirixifesoze.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s9iote4khjruieb4tj2b415dh2/konakafe.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/pizotizulinatezixubera.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0f628f9c---rediwotodira.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4cc5db8ff4a86ba5dc6860ffd3e0ad71/11873427618.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/52433936036.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098b605c6168---besarotowuxagumaf.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/4446149733.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/dorekotulajepepadufab.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/80f69b09b840d6ba65417175a268e651/gididuzinet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083394b0e9bc---bamijakolelod.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/71157279127.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5d2b19dc0c5d2aa22de29608848bb853/7440615486.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/1822253567.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acf9dd04d---44601062264.pdfIn PDF document text
    • https://peterdegendt.be/file/84556766522.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zuwaxij.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/65827638085.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b42697c86bf---10803610151.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/52757551067.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210613221117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=applications+of+trigonometry+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_off0000c22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22E 16772 bytes
SHA-256: 82faef53177530c6d6d8827476300b45344dc7694ae197be1c12de150c3afa78
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 11056 bytes
SHA-256: 76ef3526ab1064c6c5c72b01d2960ae8929aeeb9f0e2560666bfc13d9c9fdf31
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1