Malicious PDF — malware analysis report

Static analysis result for SHA-256 826d300eb7a71c62…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 22:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 95dd4f1b4b7db5c007d0594cd74ed81f SHA-1: 85776c3aa9e785ba17140f3aa3a6ee74d5c12ee0 SHA-256: 826d300eb7a71c624ad5b67ab81953368a5b885dd21e391eda1e17cb891cf336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and embedded URLs are indicative of a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613da81b34e3a---kixoko.pdf In PDF document text
    • http://alrehabourhome.com/userfiles/files/zomilog.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xojakubajimijuw.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/65836353164.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mevukomezijagadegarisepe.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/vikovaxibamujuwan.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/6908626637.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ber0rekvrj4sp4pjdflvia4toj/44168043749.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/suvin.pdfIn PDF document text
    • http://langmypham.com/luutru/files/39850019891.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/gomadudamewije.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/82424225458.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/kujomutibunixol.pdfIn PDF document text
    • https://blv.by/upload/editor/files/genofafojufawa.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/30195899501.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/anvkn67a6ddm3ta2egiplgc547/zusitipekuzovugagub.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d19d5f081---pomerelowobotumaku.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/53567583375.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/86941544573.pdfIn PDF document text
    • https://renault-service.com/userfiles/71921637433.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a79e5bd69469dd5763214bc3763f8c50/33153114010.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/jadigebumuw.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/fipegoxuxejifoxagolovi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/46f23ffffb673eb970781dd908d4e741/33015687888.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pewaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=toefl+reading+sample+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_off0000ba6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 16964 bytes
SHA-256: e64e32b6a9e904bae6405940c691c30a48b393d87d9abe77357212b0a9840aa5
font_02_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 10708 bytes
SHA-256: 49550e69764eba0417ed9805ab40c685323579444dc77de5f9c056c1413c4ba6