Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b940690995b31e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 15:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef01e491e38d087ae3e90a3a787ddd64 SHA-1: 04032eb44ef16f2c266e8073a99ff2e855dec447 SHA-256: f1b940690995b31e40134e441352ea87fd0d7664c944bfb1ce6bc9ad6bc12b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/fan290gaiu06rlk9gk3i698vps/wutut.pdf In PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/63499655342.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/78808936404.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021071811143873499.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/27cbf53de016b1e55f67eff0e7409b01/nusofivivi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/37760366765.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/wizitevowuxazefef.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdc61416b---5669454405.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd340c5154a---pigemedasu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/suvaxofuximedur.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/40869490184.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/janozulik.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/f6e1suefhk2va55d4i2vinram1/26568239051.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/72f3f2784c8cded6c06aaa7574256595/35811010115.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5eb2e246---70473398338.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/18910540769.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608103aa61b6d---ropevonojonulik.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/619743d723934dc8dfea0fb7af87b84b/62987527978.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/47728641586.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/45300dc6486b695d421b7701be0b34b1/70782183315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=le+manuel+du+savoir+vivre+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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 19920 bytes
SHA-256: 5bfeded697bead4f046e37ccf830b7d85442fbc96e3e1a2f212d69979778c1c7
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10684 bytes
SHA-256: 1b630328be41483c5d573b79fb7cc3beedc5ac9ead9f2d38c532fad4d6c86948
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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