Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15293007158cdf5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 23:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b98a864b67220bd0c826c38da4972792 SHA-1: 35a3d4e60a8c2d30be5866e5453fe63bd4449d7e SHA-256: a15293007158cdf56bceef0ce9c5183b44d57e085032958b99b1ad01a8a33eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used for phishing or distributing further malware. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://telliogluhukuk.com/userfiles/file/nasit.pdf In PDF document text
    • http://195exim.com/datas/files/51154078280.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/4712017345.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/93863659791.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613276972de6b---sasexumifotimipopafujebo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/djdh91uk15euqt78mj98cn0rjv/13844422164.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/koranareweka.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/momeserezametiguwoz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a29990c3c---50753043439.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fa810753.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0b2c657f---wonijagumowapib.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/petejinorutezop.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/16938337511.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vejumavidovubifutas.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/19404918781.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb15141ba---28414827557.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f7cb5fb9---jebalegezerelu.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/nevuvabugevigabowife.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109110549267218.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/42172317547.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/45279368234.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210902_482BD7C116E68219.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/46730856645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=transformer+tf101+android+5PDF 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 21584 bytes
SHA-256: e8d28d92a3d680f8c1c6c4afe5cf5aebe9de79768cd09af502d5d2b75fd01581
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 10740 bytes
SHA-256: 475b6f94e4a15244d3e888b8ae172e75a6d1169458f2a3770eb8152a8ab19e7e
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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