Malicious PDF — malware analysis report

Static analysis result for SHA-256 9253db45ffff16d3…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 17:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4adab7576746601eacea8f33907b324b SHA-1: 259b1c667939ba0ad5e2dfa9b7b9e16dc86c8698 SHA-256: 9253db45ffff16d3b577e641c2e52d022bc136e3cf8d045538ca5a01432df460
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable or compromised domains, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ghalemdi.com/userfiles/file/gijadudineruwim.pdf In PDF document text
    • http://csc028.com/userfiles/file/20210625223158_tdet3x.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c443f2889dd---fixonakegexil.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/vinifubelebage.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/sosasoben.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/toxefede.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/juranonobewalem.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/minonewetokunata.pdfIn PDF document text
    • http://holzweiss.at/majawodajomelala.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jikovo.pdfIn PDF document text
    • http://minhanh.com/files/98269259054.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/05679b8c0b5e86f388adc2d023ee68d9/vokipepi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/be5bf356fb1174129a96ef85ecaa33d9/towifo.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/jasevumawipubodob.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/129e4ccac35e45510f5670d52ae410d3/mibewa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/84965547111.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc16801d70---jawilikanot.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/19090061824.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b34f553f1---6146952633.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/090747315531.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/93822627039.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wexadenasejavatixeduwidix.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/882992c6c9161bdca497b826aefac676/pavobaziduga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=detector+de+mentiras+con+arduino+pdfPDF 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_off0000b269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 15612 bytes
SHA-256: b9d73fb1a3b25a0ff9823c11b01adeedbb0e67d6483f780d7f9bba0a82a2056b
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10836 bytes
SHA-256: 50a7d72c9c6bcc5f599f691ab594bfe1d4cecf8f24c1da5f865bb58cbf3d75af

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