Malicious PDF — malware analysis report

Static analysis result for SHA-256 93db43448cb66c46…

MALICIOUS

PDF

100.2 KB Created: 2021-07-02 16:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b89d30693e596e2c4ba05c282bfa78de SHA-1: f7f1d1ed4bfee1169542450bde507a375b032d58 SHA-256: 93db43448cb66c46a88dd2f74e55960fdd36dcbbfd5da59f5477cb6f0ff76774
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The document body is heavily obfuscated and unreadable, suggesting it contains malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b9594e28cf4c176d35f46ad360793c54/36286536495.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a91572747---venuwisajaditerojed.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/70442482425.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/37c5b1062fa6097976d7234756a9d722/tutomazubijutofapevanu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kagakilalebud.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/xasifujedesibedomojaw.pdfIn PDF document text
    • http://afslab.asia/upload/files/delemepikasemogewizika.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd711ea489---bixitafumi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb36f974a57---numub.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1646b503d77f2b2dfc714eea2a559ffc/72820498493.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d542cef7a8---78253456173.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f67b5527eb97559c26c8270b8d335350/54578082718.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2c3d16c88---vezimopanebikifod.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/868bblbjn5vfirk9ro8mes9s3a/gokivofigalunuwijut.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928fdf0e0c4---70927053542.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2bd3555473033389607eee7e736234b8/komojetokolejugisibideme.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/jikavalalidowanaxisoxiriw.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tabid.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67246cadc3---41652320796.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bqvraji9d3c6mcmnak2s2764id/wozidunevixilulanoluf.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa85860613---14727611322.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/36734920157.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/7ec5c891fd9ac70e01b753382b811096/duvegededezejudot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=compass+which+direction+am+i+facingPDF 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_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 2128 bytes
SHA-256: e3b371c0947b9e6c2891f87b7f66448edd63db95b70e07e69f8e4b383bbc8e91
font_02_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 19252 bytes
SHA-256: 5fc2c9574f2deb6ccac5773134ca348b960377c70722bfd90b0658e923fc79ef
font_03_sfnt_off00016a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A10 11136 bytes
SHA-256: 39ba62b6ba14f1eca3c8702a7c56cf8c7d25b7a952bbdc84868b54ac646a2f08

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