Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8799a61c6c19f86…

MALICIOUS

PDF

99.1 KB Created: 2021-09-04 12:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6efa5d331d23b250b7b3903bc544414c SHA-1: 2cc5c1b1298e88940c383320bd86e5f238b18f06 SHA-256: f8799a61c6c19f860077df90cfa4b9f1a4c9573eef23408eda9edcf5824ef146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=math+for+machine+learning+han+pdf PDF link annotation
    • https://digireg.ch/upload/81269844221.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/74920102192.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078738e0414d---40229681493.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/83782350515.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/744495435.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/57093488372.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/g527p329iue38gn83vgg1of5a8/vises.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/66982387815.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8urm9c1dbq7m8mg3rpoq937cmi/57979149695.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db64c2a6c33---32836098608.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/moniwurupuzigebagaviwi.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/48905234505.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/433dc35569323ec0b5246e0e29ff8eb8/walurizirirova.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/kekixisuvufuretuvozosu.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/3234789178.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/86096676696.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/56c2526ce44c7b7de6ceb5367cdbf2f0/moxitiwo.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210904145004.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cf9e9806---90771550086.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e3ffed7c369d4af05063e413b091b137/movojezaju.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/12676533531.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/21391774564.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/12694991514.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_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 10892 bytes
SHA-256: d16d8b85627e2733ee0d924ca5c9ebb5fe40318600d31b7af8865aa8a73bfb36
font_01_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 18432 bytes
SHA-256: 126b24be097712ae0b022ed2d75c4fb7daf50515a171cf3ea2db0b06d891ce27
font_02_sfnt_off000166b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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