Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c8ebbf02792b6a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 23:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f1ead0d4a29a6cecffe6e89473d521e SHA-1: 804d6c997082d42157d5d6181bd247313109386b SHA-256: a2c8ebbf02792b6a62fc200deb0e50d8ce4cf1a5f0f439ba6fc87f0a8b8bd502
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mh-gartengestaltung.de/userfiles/file/lewigawitepizop.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4f56e30061a1ffcdfa37bf1e89263a2c/vepidewuwigi.pdfIn PDF document text
    • https://bczenekar.hu/files/file/90644220542.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/24792cee5b30acfe56880f351ed7d6b6/11181739471.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/98066965180.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/jokizidemosobovu.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/zejajixazepezobo.pdfIn PDF document text
    • http://decorstore.eu/upload/file/61558140496.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74d84e3b7---zirisudamavegopadutelodop.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/ralunujokigisadovodaz.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/073eb37f2fbc1dcb30e4c0adf9b45076/roradaponuvus.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/sunir.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/maledefimupato.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cfcf79f---12947268228.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/70391734558.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/40449529492.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/68117562864.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/nurusevukedud.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/xegutewigukerofo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/54851373380.pdfIn PDF document text
    • https://olterus.info/contents/files/43255362678.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/vutobezuti.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5aa8e744d8fc8d33d723659743891308/lozexaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=send+files+to+android+from+pc+wifiPDF 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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 15508 bytes
SHA-256: 4629f984800f836af0bc4a4653edf0727684f1e06ca398070f8833bcd136acd5
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 10944 bytes
SHA-256: a90c5a68100a532bccb23f22aa73919927f7b45988220d9ea0caf12bc8ed52e3
font_02_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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