Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f847cfc58d14b8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 21:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee5f49b13b58b63a6c38a8b9add1fd09 SHA-1: 83944bc731c15ce3a4b73a44e38be7194cacc952 SHA-256: b7f847cfc58d14b8dc29387550889a331334fc4817a445ba6832f0425114cd33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates a likely attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=friday+night+funk+android+apk PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///tixuliritulurimoje.pdfIn PDF document text
    • https://rotitelor.com/contents/files/dadozaxokevitibevinobax.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/41298979526.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/xivivojifofit.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/sedajuxopir.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/zizagamobog.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/kupobumapa.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/23581179767.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631329986.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/gigamafefako.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b44669585---10627572400.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5d92fbe3---tevuxukupirerikix.pdfIn PDF document text
    • http://uco-kampen.com/media/files/pudibevugeredakigadunu.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/58027315803.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/lopoxabofasove.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/52966876335.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/suzelozotudabamuvo.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/puvadawefunirudugaleza.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/58869756635.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2e22caa512684c1fe4ca337ab58e8303/jesusojigepalibawori.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/korubezawaja.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/ramefijolanetumazumolije.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/10699419678.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66180157436.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/60245855729.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/bedomobu.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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 15968 bytes
SHA-256: 0655325c66ed5db0adfc386d42894e27062964a0ed240e865548605b4e40717b
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10712 bytes
SHA-256: 712a0ce5bbc77e39bbecb348b957e86243272c3c2fc1f03d75575688fcec2cd2

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