Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e55aa5a3328d20…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 10:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2bcd6364705e5988d9fa764c921aa02 SHA-1: f01bfaf0ad89d7f8598fca76ac8ef03255315cff SHA-256: 68e55aa5a3328d2049b28e3a0b457b4bf358f92a35e9333023b8938cd9e3f6c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The presence of these links and the overall structure align with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=what+is+database+security+in+dbms PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88005f5ec---11737595842.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/52927611682.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/devipofa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2467831378.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c9c55fd8---65950457211.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/987e446e95ed8a0a6c695def734056de/toverabelewewafabipi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8651b687a292100e743afea07bcd6b3e/53142795164.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/30399789490.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/sanidiwuxarogi.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kagawuvelenef.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/66b837fa20cb78aa6b77271377a691c3/xaxuxajelamawotonenotus.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609616e5ce4d3---56938958366.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc83537697---35295458429.pdfIn PDF document text
    • http://strahyi.ru/images/file/mifokeduninogabudo.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/nikutinumizuzojuninuge.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/34299314008.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/fivuzimukepunipoxinulap.pdfIn PDF document text
    • https://aspirans.com/files/file/wexalumo.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/mugiravalozotefak.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/23636522590.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3653bb84---degabawalijakasiwunu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c24066268b7569966970df7b6b6dfd9f/46464758838.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/tidon.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/93884712470.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 10816 bytes
SHA-256: 53dc25b428ccc1afdb4d37767a9ac33fba6011e242185cafbdf653b4a1dde8bf
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16876 bytes
SHA-256: c6a8fc19d409df97a07ed215f8731bc1661a5c43ea57e9b43f938265472c3137
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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