Malicious PDF — malware analysis report

Static analysis result for SHA-256 291326944de0219a…

MALICIOUS

PDF

114.1 KB Created: 2021-08-01 05:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81214c9fd99845693bcd05e4325c85ed SHA-1: a60f0fb19794c535953087ebf6830085dad88420 SHA-256: 291326944de0219adf1cd2ead5d7d32ac907fa63602a49fd668cb796ce935f8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9465

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://laborke.ru/uplcv?utm_term=silabario+en+ingles PDF link annotation
    • http://ctkupavna.ru/upload/file/direzo.pdfIn PDF document text
    • http://technocom.pl/editor/file/82823340783.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/belapevirogetugo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dewefad.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a31cfd72b9da9bed00cf4dee672b5f36/54746961973.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610419e7cc9d2---92766782445.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/53891906971.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608537c37dfef---vunapaxegedanib.pdfIn PDF document text
    • http://15889163.com/ckupload/files/49359759220.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cc6c9bdced1cc397da74bc1361061794/33857808038.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1f82f8f9---balafisulebakumafotatugu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4a3faa204---davuxu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb6bb22f6---sujemererewotonif.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/jinefevokagepedobesapi.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/69984111026.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/31743085859.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/xuxonikoletarawobulebed.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/wukokeburofafudik.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/rudokadomidorufurusisagat.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da8c353a6---30047363451.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b493c963cc8---17065631702.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/73681419197.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7840875ac553fb31f323d6c32b566736/wavipe.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/32236414566.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/kaxipugexamuzeroxe.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/napibadut.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 12592 bytes
SHA-256: c62ae8b3e0b68ffae3737a9f1cd31ca8b0c74a16bd9cc8ab870ab5d206fc59b2
font_01_sfnt_off00013d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6C 10400 bytes
SHA-256: 9e3464699a68344b813cd0bed8e938660fbe7ffb4daa35a87871f355f9c9cb93
font_02_sfnt_off000154fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FB 20396 bytes
SHA-256: 14f84d1716723110d45acfc62e8ff496ebc88581802c04a3fa0997bc3bd3e428
font_03_sfnt_off000188e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E5 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_04_sfnt_off00019ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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