Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37618d971e3efd9…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 07:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44e0cdb645f5a4760cd99ef18fc8827c SHA-1: 046ffab2f8bc64261d2824fa0f724edc2171d327 SHA-256: e37618d971e3efd9a1ddfcdadc20a79fe80e5595f10fb8a5819cddae8090e111
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://laweasy.kr/userfiles/file/98595826242.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb18f3ce5---sisibikida.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c3b52daf0dc9eb87cffe48354c44f154/zitokux.pdf
    • http://hasyo.net/files/file/wenilujir.pdf
    • http://nuitsdartistes.eu/images/file/bamavufeguxegikuro.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a135ad76---1716415476.pdf
    • https://dusunceokulu.net/resimler/files/91965458333.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7962ca57e8---dusodupogusifaponebe.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t2lmbmcgqv95vdlmed3ld5m6d8/gixekifamotaku.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac142fb459b---57544946032.pdf
    • https://xuantruongtech.com/images/ckeditor/files/letitevemijatavagedu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160847d07cb224---sumefog.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/c2uchi24kmliqbom1etjle2qi1/71634050974.pdf
    • https://et-auditing.com/userfiles/files/54570746581.pdf
    • http://cnex.cc/images/blog//file/72987322046.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/56c69a821508aa07bc07f78b24b8341b/80287298469.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3c03f628---xudawamamot.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/970d5a9b003c064ba32904fcadb3da99/94648130668.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b75bf335a90---76355248433.pdf
    • https://mfdesign.hu/files/file/putumibura.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e9813f0c0c90cfadbccfdfc878fd0d96/fifafujabuxapugixober.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945610ee3a---40456449329.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e9f77a70c696547d5f2f4cf8eed339c0/zexuwatikunuweginajujew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+open+itr+xml+file+in+java+utility
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6dc.bin
70b3b2e4505e5c26569d1aac6e980cfa0a764ec2a970e171d506ce5dd5a991a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10940 bytes
font_01_sfnt_off00010029.bin
c152b8662d2bb4638df5307561d6dae9b056301b1da9ed973893839dfb3136ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 17060 bytes
font_02_sfnt_off00012cc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 16792 bytes