Malicious PDF — malware analysis report

Static analysis result for SHA-256 023b607743d22673…

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 09:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46ed752b9e06b4a7baac82d16243836f SHA-1: 3df6f0654edd3133b65c70174011fd4d73028691 SHA-256: 023b607743d2267375662242f2bcc9a3961ea34e5209794c63f23619fab790ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the document is designed to lure users into clicking links that likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://lnianemarzenie.pl/userfiles/file/44590675167.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/11ij1oscl4u9c3pdk6ungps131/guxibagaxoxukexizaxovi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378981f44d---37413950439.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de90607d1c---8138527634.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/xawejoriwadegivegutuw.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dujeruzijafi.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/bofubumusugagatoranibon.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/xepidawakeridapixuwexuj.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/taletanezamu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ovttm71240uhmv2d51bist47ul/fegenolutalimu.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/juxiraxigore.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c73dc9adf99---dovoguxevonemidumomozi.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/memogapafoxuxewerati.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4dup3pbm6kfg3pjj1hd8bhdn63/gukuza.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7d5b48df---nolusutux.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/sosomurat.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a1afec520c7727d37a724592c09d5929/tupozujasisazapub.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/wamid.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/19323285813.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/669d621n6jn622labvrkcak9f1/53148093698.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bea2d7361---86560008132.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160915c31351f9---72228451661.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf830439ea---mamolizaxovogilutenaduf.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b319e693aee---noguwakuvav.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/19254584888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wild+n+out+cassidyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 10340 bytes
SHA-256: 6b1a1f4e6031ac0ebb62d2e53bb994351f6b46338d25a0a5d229a6699fdcc4cb
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 18272 bytes
SHA-256: f33b46961172c5b6e2751477d6314749ca17851e6764011e0fa9fac347a13178
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 16264 bytes
SHA-256: 5f3495e86a71f7a5ebe9ec0d61c830f6645aea3d960774f63de8f2069d1122df
font_03_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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