Malicious PDF — malware analysis report

Static analysis result for SHA-256 7825b1010016e63c…

MALICIOUS

PDF

80.3 KB Created: 2021-07-13 21:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6eed5ca870c6590453ea490a863d66f3 SHA-1: a09f4b071503d384aecfaa4a74a22f661fc3a2d7 SHA-256: 7825b1010016e63c15ea36ae049b2774953ca2963cba51cf5997e385e0cc13dd
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, detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://driver-jazda.pl/upload/file/50168907398.pdf
    • http://stark-tools.ru/images/uploaded/vubijakifapu.pdf
    • http://bioident.pl/photos_fck/file/pazusonabiwafufiwajido.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/b20413eec4a5eedb587c4166b4d922ae/74888847202.pdf
    • http://www.abcklima.hu//data/editorfile/vuvapomixijozowola.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b1b51f3e16a4c34b6cd8f7bbc29bd2fe/20012799870.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39d4eabf4---dakipojejavimefijolozer.pdf
    • http://lucann.com/Upload/file/53731281478.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s87ougdnn6sgt7u0sfg8gb2qvj/vezexoxanuji.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5162mfhi8p2vvsqdti91asgsc4/51835389376.pdf
    • https://chp-travel.ir/data/file/47560154747.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16258827988125.pdf
    • https://sharadsangam.org/UserFilesTwo/file/dumopu.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/248452aba493a9d6e4acfa5140967590/xumexazufebad.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/udo5tfuq469qjff6tdi0pl0bk8/rapuselezonedurixilid.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/fba35853e0919623c9114b5f16da6e61/xepebifum.pdf
    • https://panama4d.com/contents//files/fenidotolodemijumisem.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/nikexas.pdf
    • http://smit-electronic.hr/upload/datoteke/36864699688.pdf
    • http://alkanboya.com/files/file///sukoxijozelazikilikuxame.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db0467967d5---zovipidawepimawun.pdf
    • https://wolfgang-photography.com/userfiles/files/25343448837.pdf
    • https://tedvandergulik.nl/userimages/file/getugamumodalubeb.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea954f98c---fuwojavezopevet.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae5e37dd571af60289e94c563565b740/paxivowisukijusewij.pdf
    • http://childhood-matters.com/clients/49507/File/42766366524.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=moving+the+earth+the+workbook+of+excavation+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55e.bin
cdbd5d903d694dac96c4fd9562f080b6e0de56a9a623961d8dd824410cc3cde4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 17032 bytes
font_01_sfnt_off000101b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16792 bytes
font_02_sfnt_off000119c9.bin
bb94c93f611f850e106a0938f8d378057e3e5aade11f717a3c82eb3fff1099a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 11164 bytes