Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d3f31eb6b524ff…

MALICIOUS

PDF

83.3 KB Created: 2021-08-28 17:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db5bbef80572091da5653c0ef637f32d SHA-1: 8ee417b7055a22e0fbe92babdc9ff10b1c0bf0f0 SHA-256: b7d3f31eb6b524ff9ca1ba72de0bafcb6a5ee4282b734c3f2cea5ffe302b9866
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress upload storage, suggesting it's used for phishing or malware distribution. The embedded URLs lead to various domains, many of which are likely compromised or disposable, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f85ab88e---39090411522.pdf In PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210708_6705147156B9119F.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/36409575536.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64617347333.pdfIn PDF document text
    • https://sanidom.pl/img/file/mejagulutesonepinokagob.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607541b923e03---98298199503.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e7b81eb2aacb51091a3decca53f260e9/bugikota.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/22641113650.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac35e935c6---28815800179.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fea6rih6pvs420j3moao0c63s7/ravupateg.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a643037b21---xivovotulafazedutituzo.pdfIn PDF document text
    • http://climtech.com/files/files/mitavujevazujes.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0517e0cf3323a4e037ef11c87afc8ab/pamotevu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/54164806188.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a678ca8a980---sabuzunawidis.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/48600950502.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/14ea859e81a9f0d6f50be0eb4dfe02f1/gulemejiwub.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/fawivizovetokuxazojimekum.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/gidusarumijusumevuna.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210815154747.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/719874657610e91ea2bd08.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d8e593ac9400418c5c6d6445d57ed1ae/34237689654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=life+is+a+wheel+meaningPDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 18320 bytes
SHA-256: f5e2d7d7eeae76b60e2667d6ad59f130a8fae9ca522528ab7843d1eaf548240e
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 10388 bytes
SHA-256: 91bd376b3dd8076d140a6dd8614d565881733c6ba17b2a6c1d43c7e058cb76e3

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