Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bd99763d2ef7d1…

MALICIOUS

PDF

108.3 KB Created: 2021-09-07 16:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26d36fef3065ae148c15d90a36dbe334 SHA-1: 9d6f9d26b6c4659f1ae971d366b28d0b4fc6c60f SHA-256: c0bd99763d2ef7d12279589d2b49c3e0472427c3cfaec6a9260acb5b0c30edb0
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 http://pension-erlkoenig.de/img/editor/file/38786297487.pdf In PDF document text
    • http://jonme.net/ckupload/files/luwaridaduxufusiwagawop.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c0b231ca5---58237473968.pdfIn PDF document text
    • https://arerp.kr/data/file///51591790383.pdfIn PDF document text
    • http://wawa757.com/uploads/files/33026626019.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d410da18---65932512568.pdfIn PDF document text
    • http://talleresjpg.es/img/file/9274020421.pdfIn PDF document text
    • https://topupdana.com/contents//files/44544364761.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/39448631423.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/dedodoz.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lelutenuna.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/fipumakibuzojovukivur.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fce8e678568a48fc952b6b6f3c3f956/62059750727.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0g08fnngonj27ve7p7u1e3424d/fomosipikarutil.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6379eebd7f---88577237778.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f765cab123e---tetobor.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/17083592964.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/63931428143.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/xelusimemimawakebub.pdfIn PDF document text
    • http://huimao.com/upload/19280645193.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/fanatisetabororotuwuze.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/zumojoxatinejofadeweruxe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4rgg7gtnjefhq1t3e9ko1h5bv3/82372575349.pdfIn PDF document text
    • http://atomleasing.ru/media/File/93336739245.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2b8b3c2e---sixobenexabafuvido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gatekeeping+model+of+communication+pdfPDF 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_off00014091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14091 10928 bytes
SHA-256: c39f9912ed46ebddfd56014f69c5212583bb1a56d3f21c0bfc3f5ae7af1351b9
font_01_sfnt_off000159ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AB 19040 bytes
SHA-256: 209221743ce9ef8fa43fb7b3cffc90a72d777da219acc2c0fbfebab14d515bae
font_02_sfnt_off00018b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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