Malicious PDF — malware analysis report

Static analysis result for SHA-256 7223936abaa0f70d…

MALICIOUS

PDF

97.3 KB Created: 2021-08-22 02:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b1c04ed6019dfb5066514f3c78c1779d SHA-1: b328d18ebc30ff8bc5c44b8c643019ed23c98681 SHA-256: 7223936abaa0f70d2e0d1659034bbf7c1c3529701584b90d787427e8f0ff6f81
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains a link farm pointing to multiple websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing sites, indicated by the use of 'utm_term' parameters and the nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://queure.ru/uplcv?utm_term=ikea+kallax+cube+instructions PDF link annotation
    • http://rajskiewakacje.pl/userfiles/file/tasik.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a992a610584---zexuwunenibum.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/kozutubojev.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/57395384183.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/luzanafa.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vejux.pdfIn PDF document text
    • http://henca.com/files/details/file/85012162332.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c940d8aa79a---lomexefama.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/vubowedemunuxejadon.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/27155023945.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/weneraf.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/gupopisizix.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/21064994306.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda09227eae---lopemos.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729548a6eb---10225535973.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/87307258938.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/31793037839.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sakaz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af98860efd2---34639068853.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mupudomuvatixowexujuzuji.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/burulozuwigavufaz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e2d243f80f42bd56436d21d5165b537e/68820518707.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fusasikuz.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b051b679b97---bejuf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 10608 bytes
SHA-256: d1a9f0f1649c06ce8c307dce0970d30397048870cd222d3686547f13a1eee8f7
font_01_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 17284 bytes
SHA-256: cf2f0c7cda0628cc232141ddca057f1592c3e2ec31e14c9b9e8570b1f8064b04
font_02_sfnt_off00015ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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