Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a080d4c6ddd463…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 15:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f25b12a2975799673597f7088533dbf SHA-1: d31b4257df983da091828554c6047dbb0b19668f SHA-256: 31a080d4c6ddd463a0119589aed2bf9ba0c4f57a0f6f18478fb8baa25c3170e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised or disposable domains, likely to facilitate further infection or phishing. The presence of numerous PDF links and the use of disposable hosting strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://irk-yoga.ru/upload/files/69523870411.pdf In PDF document text
    • http://apcmagon.com/userfiles/61493959286.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45076ad95b---13589373874.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jumajawivepajinoferetab.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/93835516061.pdfIn PDF document text
    • http://axwelindia.com/uploads/bobudagegir.pdfIn PDF document text
    • http://stattus.com/assets/file/63284083898.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/40089035896.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/juniribazinu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/61101996399.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jolovotisanidi.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/84659076960.pdfIn PDF document text
    • http://airsoft1.ro/files/file/pafevobukesawag.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/70594212789.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6c5d7103---ziwanegemunuzub.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5r9th4dcto0lmhe85oap971uoa/sejezugoridafamafupesepif.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/joponugomanoviliteluxap.pdfIn PDF document text
    • http://uteambio.com/upload/files/81692311780.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/34263775119.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/10t0nojbuomou165qomnfr8jc3/kazodoxuzolitulawo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2e695bca---fofedexipisuzesos.pdfIn PDF document text
    • http://jarosi.hu/files/file/risotoveze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ashrae+handbook+2008+pdf+free+downloadPDF 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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 11156 bytes
SHA-256: c5f1bd55affd62798975d53129d04a4164f706923494e5bd09803c4d5809231a
font_02_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 18280 bytes
SHA-256: 295f09e60fecce75da782b3d9d5f7528bf2fed9b285c87d08e854c3feed8ff35