Malicious PDF — malware analysis report

Static analysis result for SHA-256 729fbe4956413284…

MALICIOUS

PDF

68.7 KB Created: 2021-10-21 00:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6ad99ddbfcdf4f09b02921ca33d440f SHA-1: e31dd8d08e49953881548753755363406ae49409 SHA-256: 729fbe49564132848484d8b7e316df50e481b0fee252895a6681862a35099644
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The 'Image-only document with action trigger' heuristic suggests a phishing lure. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=5th+book+of+the+old+testament+called PDF link annotation
    • https://savitravel.ro/ckfinder/userfiles/files/tolonataduvef.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a0e3f97c---vojibabese.pdfIn PDF document text
    • https://mama-light.org/business_school/uploads/file/nixovilomisexoxili.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/bovimidodibozabi.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/rojeniralisekijakilakoga.pdfIn PDF document text
    • http://bresky.cz/res/file/witamub.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/89939890145.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/49525661446.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/vizugirewunawofap.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615f64fbbf715---vigirojefuwawaniwewuso.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/6035635233.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/18298638288.pdfIn PDF document text
    • https://hinaweb.com/upload/file/20942314033.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/50a37fa5369f6bb89a5d855b33006886/53988339248.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/tibutafe.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021102812296220.pdfIn PDF document text
    • http://snft.ro/media/file/magedi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/17636038225.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/30671444690.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/xibiselosuzoxef.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/40019724923.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ebq2qjno0rj37s1km628htdu63/potutesataniduxir.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/ruxaloxesakewera.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/08214326861b1ea817c1585ac431b591/nuwawitadinilukirenivofep.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_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 13816 bytes
SHA-256: 0c7beb562d51592d10c316834f931f2101fab7dd3ca121818cb3d191ef1d91fd
font_01_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 10816 bytes
SHA-256: 2cfc478779b359cfcbfcea4dfaeddc7d11dd44d0fc92568a56297366f5767397
font_02_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.