Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d93ba84571edc2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 15:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c6dd63b5e5bc1964a1bdb26a0e43c8c SHA-1: 64f9a6f671d2454fe6239e807f9e854241fed9c2 SHA-256: 75d93ba84571edc237fbfc4ebc43cf00b5e8c40a1c441b78707b9586ff5ea56c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing operations. The presence of these elements strongly indicates a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=test+mobile+android PDF link annotation
    • https://zhansq.cn/upload/file/mepariwixu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/76821890155.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/9150062551.pdfIn PDF document text
    • https://uangraja.com/contents/files/45880328586.pdfIn PDF document text
    • http://fourfoods.com/images/files/8745848372.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/49768003185.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/91427193870.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/nemejuribezatajumub.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e340c33b8e---57335017190.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/53589817967.pdfIn PDF document text
    • https://12waktu.com/contents/files/govosixazegivir.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed63a776d---29133240193.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161415bb03eed0---54480972788.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613050d6946a4---32092653927.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/ffbb2c5ec3aa07be3613717b1a2185a3.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/lunutolumok.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914032550.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/nubatibafobiredimuka.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/49074072196.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d0a9b6f8---76557258407.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/35983182408.pdfIn PDF document text
    • http://cartopack.be/Images/file/nosum.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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 17856 bytes
SHA-256: c95ecf912815603e21fd4c2d5f358315b3c277ec08d77d51c15b0656d13058d1
font_01_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 10512 bytes
SHA-256: 9d1feb4ee49da1490bff4d8bd4204e8c55fd992628cdbd8daede942c724185cb
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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