Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ef089cad36b015…

MALICIOUS

PDF

139.4 KB Created: 2021-07-25 03:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78b36867d553e7bc4227d4d77dbd5b79 SHA-1: ec8dac39f17d5725037d3e51e9f815358871b75a SHA-256: 83ef089cad36b015c57a62dc8ec02b4547578d42b5c174564698d91725059438
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's intent is to trick the user into installing remote access software. The numerous embedded URLs, many pointing to potentially compromised or disposable hosting, indicate a phishing or credential harvesting attempt, likely serving as a lure for the remote support tool. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.halpellet.hu/userfiles/files/tiditulu.pdf In PDF document text
    • http://refinerlink.com/userfiles/file/jubani.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/sufofibawuzilaluf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c71783b59---48285579462.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/sowokalib.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2c5ibe6u0bcscnf7un585tljfg/7882351239.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ijfr548qjrfoat19170u81gsq0/tipijujixon.pdfIn PDF document text
    • http://allycatering.com/userfiles/94399543263.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/nojubewuwefofamepix.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/xarawona.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e0ecb34e4462b799c10ae9dc033a79f6/demepeditadopafipe.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/ruxasifubumajuzadilofud.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/49294250507.pdfIn PDF document text
    • http://954move.com/clients/4890/File/jinuzewimumumororewibefuv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608888697a16b---juzewaruzuxeranolapipuvur.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c26cf7d4---53055544979.pdfIn PDF document text
    • http://erictex.com/ufiles/files/wovukaxuxowenibawuvemuluf.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/46430867998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e952828db9---43873417898.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tinozigam.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7c04d763119b6eaa4c1ba94ca5df1c4/mazit.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ecf0aac7---palaxizopesuvefuze.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/wowexaxi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tinibamebanefukusive.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/robamifuwikoxugo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822d3724b5b---fuxibogoxazozapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=atlantis+antediluvian+world+pdfPDF 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_off0001b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B04A 10724 bytes
SHA-256: a8e3907787f96121ccd764ca940829961718869a6a14a77af023da22e9abf79f
font_01_sfnt_off0001c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C91E 24832 bytes
SHA-256: 999d70f0bd3a32036da7b2f7627dcb6b2260d0a6ee89a826f259cda4aad92a84
font_02_sfnt_off00020529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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