Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a540e851c41dbb…

MALICIOUS

PDF

83.5 KB Created: 2021-07-01 10:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 769a8202df9af73ed74b7f48ead13ba6 SHA-1: 3a2581733829c1f21fdb471e95788f00738a2ef8 SHA-256: 49a540e851c41dbba4f2d17f653c099322e18978f5bab7e8ea4f313bf2e7b070
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to manipulate search engine results, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to malicious content hosted on compromised sites. The embedded JavaScript and numerous URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=where+does+meiosis+take+place+in+plants PDF link annotation
    • http://kfnmdg.com/upfolder/e/files/20210618130027.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/motebimokojujulewadamag.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c490acbf705---todor.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61212035477.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cc9a176d---22958060719.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f26d5de9---vetejobuxebo.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/41326302339.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/vusovikejurew.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/vijupomikufiwusug.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/nazebozelofedugopikorowog.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/95998939774.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c34e00591ca55e43386e751ee1218ee8/11897197538.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070f682a1c27---nosim.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k38rsi26kqi63gp8npojmibn6l/4403684680.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65548c8310---18121954657.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aea8be78e---19292251336.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7612ae11---rebeteva.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/889044210387cb73e53cee3d29eb1d2b/65369505693.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0k6qdbl7f9blkb80nmucjgeph4/7153587175.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ebesm65sqqitub23c1adaood8p/goramurixaxepidajadajaxo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0235b8535---sulipu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/rikilotapofaxurijebitiniv.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e008c5ac---9704682233.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/gipositugenuzuletevefebav.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086c734110af---41787455805.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/584791e58394ca4db639cea0164ddee0/luzap.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/vobokofolizoditafox.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 17364 bytes
SHA-256: 4c64724c92265747dbe22b4a95d74d1b80913370cbd939d7870b26a7bdc57801
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 10864 bytes
SHA-256: 53da46f9fc56fbf18d6113198cf787bd64db99d551fe2ae1f4d701fe5d13e726
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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