Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f373e860827d40f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 08:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63ff7b165384b3d6bce51eda61ca544a SHA-1: ab04ec7ac23e3ca856992d1107f70b26cf76a4ed SHA-256: 6f373e860827d40f8fdb9e619effb59947e386092a0caa893afe65046825cabc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=answer+to+addition+problem+is+called
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125eed989794---47501406167.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e9884d2a---daxarebimegapedel.pdf
    • http://cuadepthanglong.com/images/ckeditor/files/21046508456.pdf
    • http://vorne-sitzen.eu/pcms/content/file/78457460169.pdf
    • http://igigeothermal.jp/userfiles/file/97331462038.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7516840637---pixix.pdf
    • http://agriturismolescuderie.eu/userfiles/files/49779716433.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jh4k0o6hqo7aheh4ea0vdpbsk2/97823505011.pdf
    • https://pacpartner.net/images_client//imagesfile/pubuvigizemeriruluj.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3lcvk31udu7ibiejcite4kjs96/36687622264.pdf
    • http://gleneaglehoa.org/images/file/jumelitupe.pdf
    • http://budka39.ru/files/72782279411.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a163f1b6---nonejobo.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/60322462994.pdf
    • https://badrivishal.com/media/88204072376.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ffec48bb7cc---65644165558.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c23b445dd---xizinidixaribolun.pdf
    • http://unseenadventure.com/userfiles/file/namudibin.pdf
    • http://cephedanismani.com/images/pages/file/zubizedifa.pdf
    • http://tycoonmedical.com/userfiles/file/11436788.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fdb33759---jilinejawanazunidakuna.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/794c1c3126265efb29e7c3af08b617f5/nimirudowoj.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e29e4e99812---48987398413.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05e182394---95472973160.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5b60ddd17025f36d8b864c0b5128b69a/71369748469.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e189.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16792 bytes
font_01_sfnt_off0000f9a0.bin
7c297804f7040b54c793e7c008a9cbecacd363275287884f82bbc8a7b1112ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10884 bytes
font_02_sfnt_off0001129b.bin
3e8acbbc1e3dbdba7651b81998e474c9e7daf0fd022479b67fa0163c4186a5c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 17132 bytes