Malicious PDF — malware analysis report

Static analysis result for SHA-256 892d48c89f15efc7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 13:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0229ed3b812099bf81a8270f92e926b6 SHA-1: e259c79b6cb4f45cc183f5fae51e7dbc743a7d93 SHA-256: 892d48c89f15efc7b79e3166dd2e5971525e2e7f8da27f49db0fdb6170157a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://italy-ex.com/images/blog/file/ravuperumugu.pdf In PDF document text
    • http://ganteltechnology.com/system/userfiles/file/56816437678.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246f082672---91533717386.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/95624196810.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/tanepamifevixip.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/be8f43ad2f22a1f50891db2f82d1128c/fajuvowuwot.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/98753704749.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/17407761957.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/57519769461.pdfIn PDF document text
    • http://precisao.org/files/files/59155703689.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/73578779373.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/99095455284.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/58213334726.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/9913775004.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/kimelagabameriki.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/tamumi.pdfIn PDF document text
    • http://geraldinekilkelly.ie/43372498726.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301796b4ef4---83323941260.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/ledimutasosulerit.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/wunoxupamataluwon.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/gaxetadef.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/folapulimejawozezo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kogegozapegimelomevesejis.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/mezivu.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/pusosewe.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/93300173340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hr+outsourcing+advantages+and+disadvantages+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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 10908 bytes
SHA-256: d0cb8425f99742f5c37b25e26e1100748de66ada29085dca3919dee2e9f546dd
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 16176 bytes
SHA-256: f2f3f7671b66719ab89eb7fbd9e359de5b213c99a2c4a395b94696f4e3f93b55

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