Malicious PDF — malware analysis report

Static analysis result for SHA-256 68efc3588d8d07b4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 05:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f66e9ddb02e1c6fc7f6dca3c127365d SHA-1: db4378d2bc1ae86f158970a06a431dc5abff65c9 SHA-256: 68efc3588d8d07b4bb16f58e6ba3ff7dcb3b21564c322f89f0ffe0f1e21b6a87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as landing pages for phishing or malware downloads. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=iphone+free+music+download+app+offline PDF link annotation
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd0de30dc---gawufavuxidalutu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/71558099398.pdfIn PDF document text
    • http://apart1day.ru/file/63749815471.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/jutunabupodoloxuw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c4bc5723ed64d30f220ddc7fb02011bd/53892166637.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/48877749442.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/72358244289.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e42981819---xipaxan.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/mutaronu.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/nafufoxuwojasodugoxaxu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/noloxatowogipawesu.pdfIn PDF document text
    • http://precisao.org/files/files/3885055368.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/9119245785.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133982f49095---10275788290.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/senuja.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0f923e09f93542964de086d720b5d890/67734863413.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/07352e67f2cbdd1e1cdf7a15de39c565/15562258720.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bf766e9317fd387fb47de0e25de98450/41426387483.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9e52ec82ca0b1793f0b81a44d5ca762/novigapob.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/juzenosijuk.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632095789963603112.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 18864 bytes
SHA-256: d49c36cd1ffac16b1646d7b1ef76c1d55cb5b84409c9719118f981c4a5e2adaa
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10924 bytes
SHA-256: 7ad7ba7d2d005b91430c60eb8877fa59f46c53cebb083fc06a453c4642fb8f37
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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