Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ea29e9594aa0cf…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 23:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5f15b5aad6924880d89ba6c4fbb633c SHA-1: bce87d42a55943298fea99bab34483b7e6c48405 SHA-256: 92ea29e9594aa0cfd5aa1735e82bad0f32b8141da9b9555a7c4f7ef8056a385d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to various domains, some of which appear to be compromised WordPress uploads. The embedded JavaScript and link farm likely serve to redirect the user to download a second-stage payload, attempting to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dlt-nkp.com/fileupload//file/44217674332.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/7085403258.pdfIn PDF document text
    • http://kahasat.cz/data/file/40978217680.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/62765786636.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/sadedixoxufu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cf822uqbj2b4ri8e8q27gna94p/55757497891.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/02ff8cc2b1c8a35dfa4a4993208804b7/98681375223.pdfIn PDF document text
    • http://berbun.com/user_img/file/35543896980.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/39319809489.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/patisuxevadaxanemiv.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16118275265a4d---95083129873.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf0918b8---dadimukojojitikonulep.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/marajubemulepebolopokobu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/52577091406.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8bl4n9os41f70udsp7o5mi1ce2/metixapebagatogamidi.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/20188586259.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/72028383548.pdfIn PDF document text
    • https://agermag.ro/mm/file/gelowerovupevo.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/61287580600.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/gibupofojuwijatakekebizax.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4c398cd6---fuwerowibika.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83409593711.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210704_081850.pdfIn PDF document text
    • https://netpage.info/userfiles/file/96674072906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=delete+pdf+text+online+freePDF 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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 10264 bytes
SHA-256: c5dc2de5bd335c393b9db78f327f9fd25b4068c1e99708f4677d02578ed12132
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 18100 bytes
SHA-256: 8dcc53ec3644c398ab6b26c9dbba3a2ae38ae19b414dcb879a63297aba73e988

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