Malicious PDF — malware analysis report

Static analysis result for SHA-256 89982b16eddbc32c…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 20:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4104bb61522fb9ca25efc5f28385ab85 SHA-1: 73b831b82ba8a11ff894cc5b46778731042a20ce SHA-256: 89982b16eddbc32c67b7c6311df60a5330b30306ab31b7b7d7270bd186ffb0cd
176 Risk Score

Malware Insights

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

This PDF document contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of a callback lure heuristic suggests it may also be used for phishing or tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vankouwenenmastop.nl/UserFiles/file/28013855427.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/perabu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dvarl2q177plj2nbmrrplk8nal/36934972953.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/knvg0j27bm33rj4clb989j7at9/56179191139.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3a5b474838e8917708a9faaa41b803/newobigepo.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/lapupatujokeza.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/902g21kkf8mi0doaa0ba8o05tj/73930370142.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b823d6329---85788176299.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085527157bfb---4945772621.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/95049202412.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9a2236ce7964908f3ca05d589f86dc05/939720930.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/g7oqp1v9qir598dqpncq2lms5e/safezodudakomaxidedixi.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gogeliweregamebezugobigex.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/497b967d807e6fcb31e5d16047104bfc/natovatumojigixopa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e12a83b2---51349958605.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b075f0610---92223574211.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tdslnlm5rl1umgo2uqqlar6rn1/63499854536.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b231b6bb5601d948befbc9517e4547de/xefovis.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9834eda4c4---27123077278.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3e99e27a486ed53de8760fd59d38e126/38646776240.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/26f3dee6383c63bee18563fd529c2c1b/5444792509.pdfIn PDF document text
    • http://semut73.com/contents//files/jelofexujezuvirazuwapel.pdfIn PDF document text
    • http://berbun.com/user_img/file/26813811419.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd1807e83c---fevojobatominikerubovawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nrp+questions+and+answersPDF 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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 10648 bytes
SHA-256: 53484036a8361748cef9826085d0e07bfeb01616bc6d02c84c8891ecaa690ea5
font_01_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 17472 bytes
SHA-256: 6fcf6c446a44a09691038747ee75cfb2ebbaf4989dd00f6796bd9cd6e018b9e9
font_02_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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