Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08b74e2be834160…

MALICIOUS

PDF

94.1 KB Created: 2021-09-19 13:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 47818dafbf8890339cf106c544ccffa0 SHA-1: f2ddb85ca2c5ecef2cb08e15a94370f7f2517179 SHA-256: a08b74e2be834160d94276b04d4295fb2c3aa5f4d6b62db4c39320451fe7cbbf
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=pes+16+for+ppsspp PDF link annotation
    • http://hcbarrett.com/user_area/file/57598848420.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/23291077335.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/31841932483.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/nupuvibif.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/71173580278.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/puzanawexesi.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/jejavudixututakewuz.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/6853740211.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301383dc83f---toruletadaremi.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/86585789878.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/birejedabo.pdfIn PDF document text
    • http://m2m2design.com/userfiles/27093313251.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/23456539782.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/52685945991.pdfIn PDF document text
    • https://kawanmto.info/contents/files/lokipiz.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/99169018670.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/dixizojonizusesabetibasa.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1951cf74a27b8c2141d58aa27028fe47/56617451515.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/legazo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4dpalr2dob881hqlhnaeq3ucik/12046619945.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/58863743906.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/87549514547.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/98250843399.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/surogeparepovukuladaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 24596 bytes
SHA-256: 05c9e8546e4cd3bebd29857f85c0838d1f0ac1cc4bfa462f52fa8148c49df917
font_01_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000153c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C3 10068 bytes
SHA-256: 0b2efdc7aefbf27c2d7150df9306f4ca53c5155a92dd73f737cc82b27f82983c

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