Malicious PDF — malware analysis report

Static analysis result for SHA-256 887407024b9edd33…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 02:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79df8b8bb863b63974d81d1aeb399436 SHA-1: 65becdfe93c54945097707d8c9e6e9ad5272ee19 SHA-256: 887407024b9edd336d6f381db96424b5fe69cfbde19bc34c389427ac83399580
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF-related heuristics further supports its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://drafthe.ru/uplcv?utm_term=free+ui+design+for+android+app PDF link annotation
    • http://gordostcrista.ru/userfiles/file/zadenames.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/5242348730.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/1392247366.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/54gm42la77vo7ktfs984h6h057/jajijobipis.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109161255051400.pdfIn PDF document text
    • https://kuepancong.com/contents/files/94478040061.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109061131585406.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/robuzubodelabazej.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614502a9d77be---viledoxidelizalivojobug.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/gezosefapijokiretitilipu.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109171755232561.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/lolurajerizajilewejeviz.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/61695761380.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/50462298637.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78777442190.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/36978824598.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/24594958651.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/tefir.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1i1p1r8vs5fge14tko8sku1bj6/gemowokasa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f0a57f09d---putejewepabud.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/junugazekuzorulenevat.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_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 10604 bytes
SHA-256: 88e17940ec5ba4e724b21e597860ca9116fa2b5d5f0afd7cd826f1786719027f
font_02_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 17828 bytes
SHA-256: 7be89740a4de6bef50596b612c14f89c6016c2fdbd9671c056f52416f92f161f