Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a07a70948a223c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ec1fd49f6d85d9bbb8652f25ad5f5ae SHA-1: fc5ba9f05e4fb1560915d67d2659175dca2a7076 SHA-256: 50a07a70948a223c6d4607c91a2f368650d7865d19b2ef95e2218335b5984528
156 Risk Score

Malware Insights

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

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 delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://yuha.be/_files/file/tidavufoxim.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8c2e55f9---17439709148.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nupedafuganapaka.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/vuxafo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161332071bdc0b---63532560412.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/12014886533.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904231328.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/26553669434.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/92980384071.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/xebomuvor.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/xokagikupubudodogukelir.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/70d2b9a9c28daa9790ff2d206d2989df/gowugogujozetezu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/10985026457.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/darotose.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/28063092393.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/84734962235.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/66945351812.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139602fc8eb3---lufizive.pdfIn PDF document text
    • http://asustainable.com/global/file/ripefuzeledezofomelago.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/48017943030.pdfIn PDF document text
    • http://att-na.com/upload/fubip.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/lamamipetufujejuboda.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/57754989951.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1eog9ub6bocduorinbt7uedvbc/21493097927.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613544812d625---gujizutikinaropapazawikuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wifi+online+hack+v7PDF 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_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 18612 bytes
SHA-256: f17b721a49e0316bfa60985f5e457ed3e2730bd424914dfeec182f50486f7114
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 10268 bytes
SHA-256: aa80da5f67a2fdbfb67aa3dadeb6cbf74d5926dba978b241238e6a88b0e08dd0

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