Malicious PDF — malware analysis report

Static analysis result for SHA-256 d871f5013358bec4…

MALICIOUS

PDF

120.7 KB Created: 2021-08-19 17:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f05423f5bce8d208e94c1e1b559d210a SHA-1: bc86fc057a155c5d4fa90cbf57693e43c1003e90 SHA-256: d871f5013358bec411579fd38ceceffdc9a4b0b21b5db22cdf438d5bed0c1c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading malicious content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://barcelonahotel.vn/UpLoadFile/file/togakite.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ce11426190f---tibajedadanuwizomijezova.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a74f72dc707---42826346148.pdfIn PDF document text
    • https://shidoremicrosys.com/media/47172496011.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcee12705---40607980150.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7b3pec7u2md0ghsmvkahcdj639/3661410389.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ae4bbfd---12416366942.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210731062620_1645799211.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/gbfutbr72ik1ntnm4glhb5ghib/dipemoxu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zipeligo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784d0c6454a---65296593969.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a179756b---75163412652.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae34bbd7e---48225740731.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/roxujujitidigaxasoluzaxab.pdfIn PDF document text
    • http://ustunongel.com/image/files/86212031375.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/820a2f864b8c83671e6ac0a354825ef3/90532566340.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e55d6f1327339a8625f5769ea7656ae6/31311450593.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/kuzowirudusatevimoluvolum.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/93128645484.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/26940949363.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/xiwukorevaxuwirag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=premam+malayalam+movie+download+in+tamil+dubbedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001402c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1402C 21744 bytes
SHA-256: 25823ef6846ad3d465d7cd2f63bba86cceae882f5205fa09bcc3092074817469
font_01_sfnt_off0001665d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665D 23480 bytes
SHA-256: 5715fe8f66bd632faae4d0a3bf55eaba5d3cca594c4acedd4ab17d26bc7e0316
font_02_sfnt_off0001a12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B945 10748 bytes
SHA-256: f012a5ea115edd317a857b88f50c5bd54c5684dffae834397a5eae2ceac6e814

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