Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b41fbc9bddf0dc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 21:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78502d402510f0708d947007942f9d78 SHA-1: 8b3f176d9bf3922a658636ef4802452c932dae45 SHA-256: 87b41fbc9bddf0dc54f430e9b4c234624bade7e0aa4c81463a42ad8e74e55d66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting it is used to distribute further malicious content. The 'SE_ENABLE_LURE' heuristic indicates the document likely attempts to trick the user into enabling macros or editing, a common tactic for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://aurorabersinar2.com/contents//files/figuxak.pdf In PDF document text
    • http://shangyi-pump.com/uploads/file/042223226218.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757ac60fec9---farerakejosilutil.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e30c7f823---37056231337.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09ee71b45---62897936937.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ec7ddc79---vekipezeladitedudifomej.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/lutolazigafezel.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b21fd656b8122cba868b9d72070b82eb/tetonemamapiri.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/vifitufixizaneribixogozi.pdfIn PDF document text
    • http://erictex.com/ufiles/files/bogijozamalit.pdfIn PDF document text
    • http://tochuchoinghi.org/files/woresetozatudij.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7c7225161a6b6eda3629692fe7d11162/govizadobolajagazob.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zowidomeligekizudidusudo.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/goluronuka.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fizameluvisik.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/kijuwebimunuv.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af461c928ff---fipuj.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c056491bf---9365632050.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d085feadb086d53e7783c95cf2b3c945/nusexurarimuxarekep.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/84362695047.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/remeguwem.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/fawazowasuzimurumajudin.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/menodas.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/tajabogidalaxaneben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=add+worksheet+in+excel+vbscriptPDF 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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 17004 bytes
SHA-256: 2c276d56f29d0e628a593e530ee00ea26997f3b8325bc905f4da5860802a4fae
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 10916 bytes
SHA-256: f4e237f84eff1691c2daba662320a1f1bd64a164641d550fd744b8a99a76ba33

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