Malicious PDF — malware analysis report

Static analysis result for SHA-256 a841d2366c4e471b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 06:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f11ca80f502343b3db611371251e2fd8 SHA-1: 626ec895b088b9156630215f578ec7bab766a509 SHA-256: a841d2366c4e471be635492b5119356e55bbdc62135a4eebd01ac60f7c2a559b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to lead users to a compromised host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c94183b1cc9---33874139165.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a5d1301267593ec385444a7ed6415f55/sixuzuzarafixijunigipu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/neluvodonuko.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e7ba5463---19377789658.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gagizosek.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/bebaxupizipuwitofejejet.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/68931749049.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/59154775906.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8da16db99---48459262372.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/57009360162.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744ed31dbd5---85456209051.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/45824808653.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb74ddf33---41251035246.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/37649951007.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b249b86a199---90033543556.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3b76d6fb691e47fba265898ad6d7e118/26889920508.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-29/20210629131045653953.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161132d7bd1259---pefejis.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/19695178428.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0220a06ba3cd6233bd0667e7b4fec4d1/mifiwoxufimawos.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/36978783035.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/53693769416.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/xubifuxobe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d007e4258---fifisodenu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/5c6cd1dc38ddf181083ef79b46ffedd1/wofebalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+merchant+of+venice+study+guide+answersPDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 18452 bytes
SHA-256: 54c6a6ccaa11da20953f1fbe56c0ab03c4942ff7be677f5f01bcc6bbbdc1950a
font_01_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 11204 bytes
SHA-256: 8fdffa0cf5323cc19bb54fd77e8160cc817868c65a1a1a7abdb778aad8f52468

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