Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44067e3615ef528…

MALICIOUS

PDF

96.1 KB Created: 2021-07-18 19:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2d207c7f0d25f3871fecbaf6f931e9c7 SHA-1: 50112c0fee821e1c988f5da5ac1dbdde84f80387 SHA-256: c44067e3615ef528e3f0756c9503264e71461f95b905ba78119553a60f5e6888
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple compromised upload paths suggests a pattern of hosting malicious content on vulnerable web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://cafesca.info/ckfinder/userfiles/files/46045522151.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb9be2e7e---bovolojevuresimaxanademov.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sqte97nam9cfos6qqfbdhjrr22/zopugusebedoresuzusi.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/wokavekagijuwaluno.pdfIn PDF document text
    • http://prestopc.it/upload/file/98164856312.pdfIn PDF document text
    • https://service-panev.com/userfiles/47052740053.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v2cc5tjuaem4gsamd9k3t110e1/50691351169.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/51377720960.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/pubufojafujewamujoramusur.pdfIn PDF document text
    • https://europartner2.pl/uploads/rawuj.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607f6f8201bef---pevefinubigeg.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c9b72358080dae6ade6a0471bc7e1bf5/46219810610.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160815fe78ab59---99418263485.pdfIn PDF document text
    • https://promise-land.com/upload/file/votiduwi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/zaxovotamofoz.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4377dc8b5---nesirapokemora.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/kumimusekavemozenefapiwi.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210614_162521.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zobenedalodi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/j4djg2oeg10qur1bfl24v8fv5q/dubatagifimisagawemifafun.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608632b7d4737---dovopepalozidoluseguwevud.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0c6e379ca9466f52dc629c06196f328c/72263266717.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160746d7672f1e---ginedapuwukatipa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/42640409049.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pogisirofuzex.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c3c90599b---82378276605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=heat+and+temperature+worksheets+grade+7PDF 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_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 11020 bytes
SHA-256: 8ab935f05e6b2cff79f9a44db00eb7cfb183683deb060140c52d6bd9d60919c9
font_01_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 17924 bytes
SHA-256: f5626c179750bb2d9555b1c050f3f251fe3dcee79940541364de829a0280431d