Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fbbb8de6eac641…

MALICIOUS

PDF

91.5 KB Created: 2021-08-21 07:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 169b89a7280e3392f206ea14e61676f8 SHA-1: eb289c4d8489354007a01f40b6a082908b38b309 SHA-256: 39fbbb8de6eac641212244ef60a0d21a4abfa197c0edfc22e82e9ec1ab6ffdf9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, specifically WordPress sites. These links likely lead to further malicious content or exploits, indicating a phishing or malware distribution attempt. The presence of multiple links on potentially compromised sites suggests an effort to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0425919f---95519629842.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd86077876b---47397503490.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/16215246703.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29041826537.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a24bd58a2bce5eb309245a8c75995f9d/womoraraludigudi.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/wunufasumigipowimopigurip.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65f2f5114c---7533310445.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/zuvogemavu.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/36586360555.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caef2cb0b5---90904664274.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/78012283347.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/gibuduxuser.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c1e40b235653dbe2a11e43fe9d79960f/28908422246.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/95420883591.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/32789daf6b98cc6198ea05c92dab24ad/28760693421.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///51585513182.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/vugukofamobiv.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/nutegebakimemadijivixele.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7259d514059d847615b292fa0e4a724d/tusur.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/31e04ed83192bbb1de508cc016cef5d2/tenokikezimofipubatenopib.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zakajozopin.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/pejenukixuzalafale.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6i85qia16hk1a9ibf5kot6002c/xobuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=100+a%C3%B1os+de+soledad+resumen+completo+por+capitulosPDF 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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 11056 bytes
SHA-256: e78b47719614e626a8528dee9c765e12e71c79deb93f1dce04031bb67277c2bf
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DE 17524 bytes
SHA-256: d54f1ac77c796ca101af9fc39215937bfa81b8f9b58b8d223c885be6ae63d546

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