Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de3643aca61a88f…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 20:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46f1a8b31ed825a16c3307dd16d9e7da SHA-1: 4b1328c056b34a495904071741d363cbe8eeae51 SHA-256: 2de3643aca61a88f378ba72197f3fb13831018fba2ecf5abfc15aa17bc00f239
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such documents for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://kaiyudachem.com/filespath/files/20210805141306.pdf In PDF document text
    • http://mai-colle.jp/userfiles/file/83515296699.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/13149679133.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1d8b695ec97988af6de72afaad08a609/rivasulenapude.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/29607027905.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/fevudibivezonotori.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/22951409629.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965789acbc7---dosafemazorazifizisizeg.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zejaverexolokujovirekepa.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c49b6113c---zupedirid.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f017fce6754473185f2379b36fcb5d3a/43727523494.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6fuahfbuoirc300cj84tiqbor5/74130153776.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/63669669501.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/43915377321.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kopadusoboxeje.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db96e45b123---wazesivijegozejosewapo.pdfIn PDF document text
    • http://hak-al.com/resimler/files/36471036791.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/52eecb0bf24fdda86963a8a938eede40/buratulofunetatikipi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6a1a2c1c993a93df71c9fbff36189c10/82826589582.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/29112834366.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/53600456953.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/joxiviwewibitapiniwodix.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff339df2086---wejotixoxiselimiwu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1ca280dbcb3415fd2cb42a0105e9c0b3/sajarujikofipoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+pre+workout+for+weight+loss+female+naturalPDF 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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 11136 bytes
SHA-256: 8056ccb628e94bd37c6aae008be04954f5a22390b6293127ed52fd23df305ad9
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16920 bytes
SHA-256: 53f0c1ceea5c364993988ecf881915d17435db2674ef5b425e2313e7a798ad36
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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