Malicious PDF — malware analysis report

Static analysis result for SHA-256 937ce4d63aa25fdb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 14:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c082169100586ef34962afaaf07d80e0 SHA-1: bbb08db62cd9a7e47b7e4c2f013cdd5cf1948e3f SHA-256: 937ce4d63aa25fdb2a4d902e859eed07c8e1969de1de12935e3e6d914b3316c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tincorner.vn/uploads/files/tefek.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/18eba2ae1dd4fbb92b18dcc68dc0c944/jakebujuvidijanezogoxil.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/punesejapixulufifowi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/92375758602.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a74a6058699---57997729120.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/rojusidiwo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611556121f8e7---vovegewalador.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/vuwapazijigamenekuwa.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/92012903357.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//raseroxilom.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/98024742750.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e3a816f1---pefunadawejijajelebovo.pdfIn PDF document text
    • http://malifer.hu/upload/file/digexona.pdfIn PDF document text
    • https://korankertas.com/contents/files/kaxulefitexofodonerube.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/vapeta.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d06e52a46e11be06878d6c3bbfdd756c/70342383741.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d175b779---zisame.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb588667c2---32774643024.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/fegifepejujizato.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e547ade813c---2196511034.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/67560396023.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1f402b6d---jakotu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/33785627501.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/fanebowubomub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=honda+jazz+manual+bekas+surabayaPDF 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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16928 bytes
SHA-256: 1e64aecfd5da1ed5cf7705f3d615b9d4724b07bf5df28f8c20ccc807e03a02fe
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 10848 bytes
SHA-256: 1a2bf11416d410432782102cf604d176c406d1174ee2fec46903eb7819382d3f

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