Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49b067ae58b38a1…

MALICIOUS

PDF

113.4 KB Created: 2021-09-02 03:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a76bb430ba10892efab23d5ec5010a11 SHA-1: 507984b2d0d26c90dda0aafcba66ff0afaa392cd SHA-256: b49b067ae58b38a1d57cb344b876018f6c279aeb04c4d6a111a5f9563c2b0ce6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and compromised CMS upload links further supports the attack pattern of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=the+weeknd+fun+facts PDF link annotation
    • http://www.urbanwaterways.info/files/85592266489.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/sefotagedib.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/ponalos.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/womunodexavojop.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3fcc328b8---fotuzogexatosasitanil.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/79247928106.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d58f3b2f1e238980467a581ce516bf76/koxuluvasibawopabodulidis.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/51131685585.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/metozariloxu.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/fidefururukemi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b0e8b861---27432872039.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57386624928.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f2e885352---80607850844.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/vubamaladoxagusotep.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/dipafuzitox.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_off00015304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B16 20468 bytes
SHA-256: c1cd94d9a4a4fada66bcfcbdd7bdb65dc744afab8f4460b3d30a1b3a1d91823a
font_02_sfnt_off0001a142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A142 10456 bytes
SHA-256: 511db2ddb708b4af4e7f3b5ce6faf0149dd4d3dfabc75b88ddbd5a22340b31b1

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