Malicious PDF — malware analysis report

Static analysis result for SHA-256 185df0432e8b0d14…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 04:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d1fd2405e03d8cb8a2b33a6c3b55629 SHA-1: a97be016f5d0052ce10438259d4cd5ec0bb3fdae SHA-256: 185df0432e8b0d14400db9d3eb40eb614cf344e62eed5d5b8bfba2e40be09067
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not appear to contain executable content directly, but serve to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bfa5bdbd087fab83b68d8cecc2aa7128/wefuziti.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/42438693195.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f38fe0ffd75d3e3c8672c7a98f8f9945/papupenukulusijalesase.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/zedugitiberajumun.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/kopozufelogife.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/39481646998.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/pabegerubetofiguvasaxim.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3ef4946a1d52d6b27f9f4a494cd744d3/41588498012.pdfIn PDF document text
    • https://naves.cz/res/file/1904716859.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748a50d32c5---fudaj.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/36995827736.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad7fb7ae1---27415893764.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d40c8334543422cedb99ba5e8e1bf7b4/dapufiduzob.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c8654989---71517091857.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/03ca70030fd72fc439fc64eaac98a5de/tusukezin.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/6147713241.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/11294502540.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9cma09cu4crh4p7qkn0g1is9f7/gabiwekutavapadedanok.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b228d8c20ff---melupedetubuzirixu.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zagamopu.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/27513913912.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/78341995508.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/begolenuranixituzufuba.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c051e1ae8b---62647325315.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efab0929f---zusafexedasa.pdfIn PDF document text
    • https://clove7.com/userfiles/file/dusoposomowatidegatu.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/gazozapopofav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+epithelial+cellsPDF 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_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 10448 bytes
SHA-256: 8da764eed5c48645408b94a11e65616f2ce64f3f66403d4d24cf2050f181b536
font_02_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16292 bytes
SHA-256: 5f4f5f8fad7121e8eb87ea6609203d123df3c3c25962dd8862a1362752c7ddf8

Open this report in the interactive analyzer, or submit your own file for analysis.