Malicious PDF — malware analysis report

Static analysis result for SHA-256 534d335ee8355749…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 13:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 30e7aae0631d9f1aac93fa06daf8a924 SHA-1: b9e9a80e4af9947c1b9290ebb0f4e6e1b1c29452 SHA-256: 534d335ee83557497ee61b2bd140676e77ffad1a83fb0987727ada483d2f1274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://oniceh.ru/uplcv?utm_term=north+korea+smartphone PDF link annotation
    • http://paulgraphics.paulsfashion.in/files/ledalabotimomibalekasu.pdfIn PDF document text
    • https://websbag.com/uploads/files/befokakasok.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pizoze.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kibilozakibaxixibidebo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kazuduwukinusutadatixiru.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/bijiberepigomasavogib.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/jubugiki.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7d64dc6f2d0376705e8aebf6916eea9b/buxunufo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/84527764682.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109081932167087.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/36797985333.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/94811531121.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/84706409325.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f926d4973c---34547282444.pdfIn PDF document text
    • https://matrixx.lu/images/wikojoridazoses.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/libijatibisotejonuva.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142355eed5ef---xabupovogodovuluxezipok.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pidirunujamu.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/77395171769.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/59521170806.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/depexatofadomijuzip.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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 19524 bytes
SHA-256: 1408d460dfcfae15d0f99b666f8a7d9774fbd0e936c45bb0ec165e90acabd40c
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 10448 bytes
SHA-256: 89391caf6544cd4aeaa83d78f252e569b06cb28c51ace335f51befb5aa81717c
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1