Malicious PDF — malware analysis report

Static analysis result for SHA-256 516d7b8daa491ef2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 02:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7fe0d7463055c585f6c7800b84183173 SHA-1: a3972d5c655638a023d5d72c78c4ae07e0d2ef14 SHA-256: 516d7b8daa491ef2d310b7f1e57bedbc6c9fca6757f5db906b1d62a4cefb16a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://wastran.ru/uplcv?utm_term=divergente+libro+pdf PDF link annotation
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lotajezutumodujugafib.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a836dce94---7922313506.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/34074951526.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/7290893251.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161270c9431c61---75613702935.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d4c72150213dc9c043163f63808a9694/36180152169.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/rosevekaxezenanuf.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ng8mhguqvlbbpu09d3d3jint30/59016230459.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/t84bifb2qgv05sbhikfau2utao/85886166743.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/vopajamufejisarar.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/pagekudajabepazebapudeba.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/84011209364.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/28475578987.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d2bded0e---revibitikanukaburedasese.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/79eeddbb2f1796a282f3df790a901a96/21921635356.pdfIn PDF document text
    • https://xistenze.com/files/files/xejubekas.pdfIn PDF document text
    • http://travellerisland.com/files/xifanafesawafege.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/79369641144.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/18518806088.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/zelivogin.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021615015337036.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/kubigu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607706fd7aeeb---48710274871.pdfIn PDF document text
    • https://ridersshop.it/file/96985984366.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/63143182260.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/wuwolow.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 10552 bytes
SHA-256: a5e87378895cb1f87750e1b9645ed5973a2bb96fb8a947e15887ce062d0d9498
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 17824 bytes
SHA-256: 8eea45d3e4ae0eda255cf2c58eb62210aba518fd115a89e167d2bbb653080e40
font_02_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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