Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8134edb12ff9bdc…

MALICIOUS

PDF

112.7 KB Created: 2021-08-21 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 49001be0ad320e58ffd0328a4362ed3c SHA-1: ed7938a3606c5834b93d0318b5a96bcd64db264f SHA-256: d8134edb12ff9bdcd4d69038966a7d75e5bcdfff0642efdac7ad2a176eeb9a45
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to manipulate search engine results or distribute further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://theonejsc.com/userfiles/file/82573495918.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6fc7666dbe16db62ce6595118aac1073/79366314944.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af98860efd2---34639068853.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/6199368058.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cfmm68vlcclur5mn5ot65c2pt1/89168337781.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/67384834800.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/wabek.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8aprutmufrg82q2ee6bjbqdth5/jasodanusuwevisejaf.pdfIn PDF document text
    • https://pellevah.com/upload/files/7132642121.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/96978051993.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a43c915e437c166e90a9a86940c60a09/fesomukov.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8bb0667d87437aaf9700c31b560fd96c/11551287394.pdfIn PDF document text
    • http://afslab.asia/upload/files/bezasefavemukobumiga.pdfIn PDF document text
    • https://bauarch.bg/files/29902639990.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1627056392.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/74515101072.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/82898981280.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210801055317.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/6103063801.pdfIn PDF document text
    • http://honghuibio.com/d/files/10917886345.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/90788500195.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3f20f04cf2788f787b123b1f05cc1cbe/20286810473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=que+son+los+recursos+literarios+de+un+poemaPDF 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_off00014e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E61 10832 bytes
SHA-256: 5a3f6b0edb8f607f071a147a01d0c0779f251fe53894453b284a0e18625bd8ab
font_01_sfnt_off00016774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16774 20284 bytes
SHA-256: 799e12d7c7ff9e8a9d34c1e9709f723f9a71188938c0f636cc9236258fbb8976
font_02_sfnt_off00019a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1