Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a512afaf2ef375d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 22:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75943008dfe0cd2ce197958811400d7a SHA-1: b0178096c3f8cd175689428da2d8e3331702d3be SHA-256: 3a512afaf2ef375d67d28a48a579a1b8ec8ca6fcea151392dd52d2e859b61397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=indian+idol+2013+contestants PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9696293c---ladilalilapigiwedupanewu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/3223164593.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/xovazobupobekofuziwipufi.pdfIn PDF document text
    • http://sun-tes.ru/files/file/mobidunetamipotekep.pdfIn PDF document text
    • https://tmtteks.com/files/zifotasusikezoberela.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/rijokujirese.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139bdbc848c3---kosebapumolenobuwe.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/74602557036.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/75426299111.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109011911147333.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zidesakopi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136997006422---71891003924.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/tajetefel.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sufuravutata.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/vasujuwakuveda.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613901dd43192---jokiv.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/45783926271.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/kovovoxigus.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/15921558827.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/bodebisasefogazalumakutaj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613020e23f5e2---sisepematonolubozix.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb221bff28---29685124847.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ba467d90b5db727c1d4f32455ba00e6a/wazegibax.pdfIn PDF document text
    • 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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 17896 bytes
SHA-256: fd7b1011b6ae24a46f3ccdbe436960b1cec001e6d811624165f02b8809dd024c
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10680 bytes
SHA-256: e64f4a0e6c84cd0e82740f9b693c011c42ca8a2d62b7cf1bda0bc0d7f0d76e88

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