Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b92a0e8a416df2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-03 03:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7b0d2c46e7d1e3e8ee7c717a81710ef SHA-1: 1846d76b0422f88a92ca9c1a873825dc1f181913 SHA-256: d9b92a0e8a416df263626320dee82227d5f8e60029ca2c8dccf40fc7eeffb606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to potentially compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to host and distribute malicious content, likely through a phishing lure disguised as a document. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that leverage embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6592ecad41---lusudovomemifidon.pdf In PDF document text
    • http://drivingschool-brno.eu/files/jidopefidakezoxunose.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/tedazilowasavo.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/leduretapovodemiderej.pdfIn PDF document text
    • http://kag.fr/userfiles/file/83316674923.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608791bf92eb4---kasurovupilokudepulif.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6ef46f33e82b14611c44d76ac6a8998a/similinuwoxup.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/46185276715.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb26e3197---21944319320.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/roxuzabena.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jagiwanukelanubiwebu.pdfIn PDF document text
    • http://st03.it/userfiles/files/posavimavevira.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/48230791308.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72889680834a4eeba1faba06cd660ea8/wupanip.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82467211765.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/74016149954.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/36115077370.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/14540468756.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/79659896044.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/varorapoka.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/gadoxuvixoxejixaxuk.pdfIn PDF document text
    • http://apple888.vn/luutru/files/14693311768.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/781928dfbb0c37d086e418749ebd80ed/30166061584.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/63721713308.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/dabirinakegumupovajirafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=darjeeling+tourist+map+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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 11072 bytes
SHA-256: dd15b5d144b062e11931eb8eb12c43765c93e90653e002d12a5b22a9e32e4783
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 18284 bytes
SHA-256: 744a73b956d4b1dbf7d8892f68c70c0448baae633769f8fd25e1e45d858e3653

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