Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99b78f93788158f…

MALICIOUS

PDF

153.8 KB Created: 2021-07-02 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f290ef5bf2fe38e8b1d22f5431d0987 SHA-1: b02b85bd0e90606112abd0849279868d263b7159 SHA-256: d99b78f93788158fb675431fe6c08102e52b931dbe854ed9e0ec3840feb07fd8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the nature of the links indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://wastran.ru/uplcv?utm_term=single+dating+engaged+married+free+pdf PDF link annotation
    • http://soupworld.de/upload/file/vuraf.pdfIn PDF document text
    • http://sam-global.info/files/file/dakirigoweturiwad.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d74355df3.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/cd4ebc591b2b58cc9a2ac9e98dbb519e/4941857964.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/52242128566.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/xumanisotuzenito.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/womule.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d6e9245173a9867d296b731ed8bb4e1a/tusijuv.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8126e08ea---84213341465.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/80e03a6af4ae32fc70ef593f01963a38/xilazupeforefagedopon.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ridotip.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cd15e9c4---tebab.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/raposafagekefulunujus.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098530c9150a---zotuguxot.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2591a14afc7d26c4c198533036a9e112/dudodovonejefixivibosakes.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/24336440342.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55030e552---sukewapisabifel.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/cnc3gijd3tie9ln7unvdnp5vug/putejudo.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/55448210773.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/laluwamomesuvakigopatawe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a461b537---jedofumuzibipisexijugafoj.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e5fb088cadc6d23f738ffc949eb48883/waxuvuma.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nakarewutepavezebotefepup.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_off0001f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F92B 10628 bytes
SHA-256: 73900328af8ca00f8c5a5dbd89c6df6dfa5897b6450c0edc1b1a42f5b9c1944e
font_01_sfnt_off00021132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21132 18560 bytes
SHA-256: d35b4c836cd2a912c5800e72fef36ab795e4d105704cb27bdd2e53c02903a426
font_02_sfnt_off0002415b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2415B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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