Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacb435bef5214ac…

MALICIOUS

PDF

117.4 KB Created: 2021-09-08 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9be0a5b07da228ab490c73506caf794f SHA-1: e78ea2d18bf2eadcfbdec6cbe43c9f4432e9f32f SHA-256: bacb435bef5214ac46caf7074a44ae8916995dc2bd6314794cb8a415df14c30f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery information. The presence of numerous links to potentially compromised or disposable hosting sites, as well as a high ML classifier score, further supports a malicious phishing or scam campaign. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://neoneofytou.com/ckfinder/userfiles/files/nafewovevukaxibiv.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/rilebataralagaziselawak.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/witufaruvedono.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029ca2aba5---tezakinofelametabi.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/8093687159.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c989b85c3---rejabezaralasojakib.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/75128240986.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1e4ddfc3da1174313fe671b39ac8f6d/lewituvupavozuje.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/xonigeguzumufaxiwab.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/dikojig.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e610ff270eb9c31914e00d58eabfa25/41430727716.pdfIn PDF document text
    • http://texmet.pl/userimages/file/64265249925.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8240e76d8f9b09b4eed5a9d3d7fc8128/10845112712.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077718108502---7070316593.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e926b3dce482e9bf0d64ecf5a016313c/tozokik.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5f0ada0797a8396ff920a2619913c4d0/54398169221.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cada32c7e40f76ffb80bde3b98a35d97/46659760156.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85632957121.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/fo1lgq843e53hlrk54udqla0q4/vilurit.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/15170c56a2da895f25db72fd1a8853cc/vivuso.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oe0sp15hsclv9sjasg3udkpvt4/paxiwosoxugapazekota.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/25om026cn1rfb3ai92c9ffdam0/gikukogepajewagatav.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rsn19lq2gcth3dg2l7g295po6n/dopavakum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+remainder+theorem+proof+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_off00016297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA9 19960 bytes
SHA-256: 4474a6640e73fc7e1ff6890bf0bfd14e171cf846660b12bf5c9ed4dbb6bfb97e
font_02_sfnt_off0001af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF2C 10748 bytes
SHA-256: 39dc2e2926f8577c9c8d743aeff53a5ae7dc4e6f2934fc8a13df13789faea930

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