Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4a8d9296a12cd3…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e73aa8225011eca25a9cd68a532b76b SHA-1: 7423240a23ac31bd4fa1db6c5447b15ffdcd28ce SHA-256: 1f4a8d9296a12cd38b26fe1682b1ba3190c3a09b67c2d53e37ea8a168d9910a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDFs hosted on various domains, many of which are flagged as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://itkaufmann.com/images/fckimages/file/88476592582.pdf In PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xirazijesaza.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/laramupinajutuxefiv.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/6061373872.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/99750607752.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/mexakasanuxazibuxa.pdfIn PDF document text
    • http://ativn.com/upload/file/52628049867.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/jerabuvoso.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/42581660341.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/28942902183.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/11664740426.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/kesiwiwufegotikobasedoguf.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bebdeb55b---5763005191.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/60bae5dbb153f92dc59d27982173112f/33205041886.pdfIn PDF document text
    • http://surausa.com/uploads/files/73573424591.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139c108e2498---27613344286.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/kegutolevevexumidekuxon.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/finuwosax.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/worupisatoviz.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_185942.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/jefupuraredasiwosonul.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/fokikasopebizadilir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=english+alive+course+book+8+solutionsPDF 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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 14736 bytes
SHA-256: 0c5f3e24a90c42fb44c06d2ea8a57b0bad648d91a532e6408bf9885a36fd31d6
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 11100 bytes
SHA-256: 1f639e3943f16d338f16b01f4e150429bc26d9e3243dae6f5401cc8549fa235f

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