Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28a38fec5ade790…

MALICIOUS

PDF

85.3 KB Created: 2021-08-23 19:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1654afdbabdc88e42e87f4306ca91c1 SHA-1: 5cecb342660927376fd3dc0cfc769dd1d6b146d1 SHA-256: a28a38fec5ade790eff9f2bbb48506a63379a98d6420f1e20d2f59ebfe1e4a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=science+of+breath+pdf PDF link annotation
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/56959909405.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/46528338405.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe530e2571f---89993451521.pdfIn PDF document text
    • http://findusafranchise.com/files/files/41890624570.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b0d102234---loniwit.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/pekulokixuniva.pdfIn PDF document text
    • http://belloverde.net/emailer/file/kilijagido.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/leketemopi.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/54548264398.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfc6a78670---41985423057.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/61d334b29c1b9b0435f97590c7826cea/44850617277.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/1978683487.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/borabed.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089c33e41da0---78789002740.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/32411313542.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608896264bf4e---pimezig.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5725ecea8---kogifatufimevorilakavi.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/sojevurixapagug.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/51053202652.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/17203516537.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/58807077568.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/wutubidovo.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7656480937428762d782bf83feaeaf47/dibupav.pdfIn PDF document text
    • https://norservis.com/files/files/fimizizo.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/regixiniw.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607568d7b8571---puwenuvekomiwumubo.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_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16856 bytes
SHA-256: f2d2da97912c7d10dc162e58a1f95bb7f7550248189a815ebce14ab5cc5fa5a9
font_02_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 10720 bytes
SHA-256: c770039c8e912b90c3894c91416f505ce81a3daa43b99d8f65e252178ad22471

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