Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897e50383843546…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 17:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ad39d1e163561c08c15f1b2ede5c6a2 SHA-1: 0307e2856343d5bf0e7c6976ed6e73c799e35524 SHA-256: 6897e503838435467f549e8374bb19bdee9aee8bdfc1eccffe9454dbf8ff6016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or 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 PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://synerhu.ru/uplcv?utm_term=tunnelbear+apk+for+pc PDF link annotation
    • http://turnwealthy.com/ckfinder/userfiles/files/riwetedapev.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/34919080475.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/63580447171.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/nonadavid.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/75434048151.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/fikuxiraxu.pdfIn PDF document text
    • http://maihome.hu/admin1/file/37542566665.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/78097433538.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/99668863593.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/pebuzetiz.pdfIn PDF document text
    • http://webursitet.org/Files/file/72672681263.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408d9a87b54---xujonapivijotexigomatude.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/xasiniwivuvunoki.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/6668042803.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc310121a7---37077842818.pdfIn PDF document text
    • http://gardatrans.com/content/Files/91990308125.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/roberiba.pdfIn PDF document text
    • http://orlickachata.cz/files/files/49722058988.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/41420507091.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/47751236497.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/78509883814.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2156400d---84269539206.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/23329390833.pdfIn PDF document text
    • https://vitanov.rs/files/sowikibibapil.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139dcb7c43fd---51888603665.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/5255345304.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 18252 bytes
SHA-256: 5e6fa94c6a798648aa4ae662ed872a7207a224a14e47412d1bf5d8613718f0c3
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 10408 bytes
SHA-256: 77b075b8e21a0a210b3ece48c6cbb33133de496edfd78f398a9d6c6f388787de
font_02_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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