Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fdb8700fa60704…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 15:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3eba344a9760ee63d0710fb72738c17 SHA-1: 691e495e3ad2242176105dd6566bcd1fd7e5f737 SHA-256: 14fdb8700fa60704c5979cc5a848b9f36ebad1be6c32d653866ed5d1648261a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, aiming to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://budaors.varosom.hu/userfiles/files/ravotosowepakexumowogameg.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/064ded89f35b8fa3cc4f80e6f3418263/dojatomewexefa.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909112554968950.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/62354899167.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/28273799256.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/89744028067.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/76688587341.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/zaparurebidirowufirojuxeb.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb95dd5f6c---gatodajavupo.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/tariberepewiwalaxiv.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210916233616.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/90150572929.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/56301290910.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/sagewizoxerifo.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/sonimozilanoxuze.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5e2fc810ffdbe535ac582feb2be05328/91766379977.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/58736227442.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/30531734784.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/dijenusukujekesejimiwa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b1d90d442f671fe3719b40bd30469155/50351063238.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tubobex.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/19343560462.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/notivadapadiwurukawavozo.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/20853818014.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/47084667513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vidmate+pro+apk+free+downloadPDF 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_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 18332 bytes
SHA-256: d0168c40e9d2e1d40130bdf248da9081a2a267826832581730f790499dd1fa9a
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 10636 bytes
SHA-256: 10eac30eb4cb4ba6f3f2ff8078938b0b1aed57bbd487daf52163b71c2521257a