Malicious PDF — malware analysis report

Static analysis result for SHA-256 a618754c18a6c907…

MALICIOUS

PDF

87.5 KB Created: 2021-08-06 14:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fdb6157506b48775e86ac7e71aedc72f SHA-1: d8b39711a556f7e3cfa5d14da08bae5283a137b6 SHA-256: a618754c18a6c907e74a13416ceb920ae90a3989d0f7eb2fe4c0263be3fef008
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable domains. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stavo-bazar.cz/userfiles/file/wasev.pdf In PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/31469581081.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lawunoramomima.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7597d3d1557b2786e2792825f32fcfad/mubetozulunuvoru.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kp2opk29f46s5p5221um3k9093/zabafomowofa.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2902fdfb4076c4ee6f10edadc4dee448/2914838765.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/61816872555.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/ririb.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086a911b3657---41104761677.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/084d9dc06b6a76feb810ad39df408df5/jewojirivuwe.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/kexigutabopaxobitudux.pdfIn PDF document text
    • http://unsersohn.ch/images/file/26882326051.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/faf814de793620f0823308b62d5cdd7b/zudonoluzun.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/wululekewejakojebuto.pdfIn PDF document text
    • https://adium.ru/userfiles/file/tonudobamo.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/mamuviguval.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c066ef4dddd---5493703930.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/dawubadawejobusiw.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8323a322e---fuzevejobunirexorirenu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/jijimufol.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/bowuririj.pdfIn PDF document text
    • http://sun-eko.eu/files/file/52998180238.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc42d0b038---78540948699.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/pometituxipozi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44f871f4e95d93e77eed948e690b4dfd/87935473770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=microsoft+activex+data+objects+%28multidimensional%29+6.0+libraryPDF 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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 17172 bytes
SHA-256: 0d942da71f6d6a585a8e2a6d26905c53e2982c3f7c259a27be7212155fdd19ba
font_01_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 11792 bytes
SHA-256: 9030924f3c0df97d87dca12d0a2858c0a5a04269d1f5444d963135134805b72f

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