Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c3e04edbc6176f…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 14:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e556963b89aff41487bff8ce22d672fd SHA-1: fea1a5bf0a88f601a1dea1f32c6f6cc23c6ce27c SHA-256: 80c3e04edbc6176f371bb83639df97fad7a29050b74c9dad9429b7818fb4e3df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=electrochemical+cells+lab+answers+experiment+21 PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/g0udvi0s6rdf9tdlalm5ap61hh/funubowakutunobutoset.pdfIn PDF document text
    • https://haidangpc.com/contents/files/defixaxa.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fcdb4d97---32410023436.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/97495314490.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/lakoteparimaludiseb.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61970278d6---giromokev.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/96081559010.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160741b342a958---getakeleru.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/278741295d5b455ca3a7873a2c8edbf8/27210680453.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/gofuzifilumenolaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6215f3761d---fepufug.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c0571639---rulofenilebawukarad.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/93202159847.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/mosevobubapoxul.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/61b56c7914fed09ba5ad9e1da781a7f4/71213796136.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tnn1k1pmocuvgl1pi8rkcusmtc/molezerevof.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850ab733d7e---xezajomowukamax.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/jovarawesavazododova.pdfIn PDF document text
    • https://micsys.in/userfiles/file/9993439317.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b2cdd8226303d1b057a77c780bfead74/32211057583.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/b92o1pk77mvpk855ol54q3562q/wafoxosugifivuvodozopapu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/63950803932.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/29319669368.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zevemuzurawevejegexorowo.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_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16492 bytes
SHA-256: 400bfd341d928f766a964f88679a8178f11cfcc128d0cdf2d0736f279792a5ce
font_01_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 11120 bytes
SHA-256: 13c404ceea628c8f7c75802fd2a0c4383a6c805fe39eeae4c6557cd12d196fdb
font_02_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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