Malicious PDF — malware analysis report

Static analysis result for SHA-256 e781bb7911a46869…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 04:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55b85253f11dc9a81f1948cc06f5b93a SHA-1: fb308f0b69b5d9e8aaafc1b448e1c1dcdb67a38c SHA-256: e781bb7911a468696abf9a894e8751bbe0fdf970d911be9a8ba909ffbe02626f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to PDFs hosted on compromised WordPress sites and disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b325b4e83---gobilakig.pdf In PDF document text
    • http://tbff-bygg.se/img/files/93139237863.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb040784d071b2f1bbb9f1c602b97a81/bomoder.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q5li6e53a9ffihekreui024l16/pedewopimilonudogadutu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/sgctqepe26dk8nfvkif9v5krqi/zipalalaw.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57884167350.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1486895e11---kazegutaropelotetaxolis.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xapomewijabuxuvawakasa.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/13086650431.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/29060840574.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/80631968939.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f74fad2f3---84795079014.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/bideremuwos.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f63a7ee4c---xowenoviwusulutikowogagi.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/12557746956.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/patakolejo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7eb32b2cfc4e1701fbfb01ba1fa7721d/60207559696.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210608_AB2E314A0881579E.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/2475781250.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c782eef698---vafejerepifepupabulu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078afef3f597---75037973136.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/86954511763.pdfIn PDF document text
    • http://anpo.vn/upload/files/88418574887.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b002419a---wegajusogogudeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pronouns+agree+with+their+antecedentsPDF 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_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 16936 bytes
SHA-256: b04dc3ee87d07d0ff7cca4ac1b7de81b0075af39918c612e8dcc19100291f5a7
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 10788 bytes
SHA-256: 101b1cf0ae446a292269951b2c4523c4e5fef269f96fcea6023a6e951aae5144
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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