Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0caf26848a300bf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 07:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5397cebf9b6d9da916bae32e1c58d87 SHA-1: b7201c8425e476f690253c6e4ae17761a92d6633 SHA-256: d0caf26848a300bf0ca5fcf5a6f2e9462578d4ea9d94fd88156284c80b28ac41
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable hosting further supports this. The embedded JavaScript is likely responsible for initiating the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://charlesstreetvideo.com/userfiles/file/tajegosafexopeda.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adb94f5be23---54062773692.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60024786556.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/97099809273.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/16976786436.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/60218559322.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/josasoni.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/kizojinopotixetizorufiwu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/waxatofawupojanapugovugap.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/99330391045.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/85673937372.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lifemolol.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1clb8nlk58sb75ui1ubq77p1q2/62642199160.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/wisixinogugo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608296d554eab---fisapozoxodoxuzedugudawar.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f988b06e---32442795840.pdfPDF link annotation
    • http://dieukhactransam.com/uploads/files/bemun.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0f820503ee0c5e4e93cd7a32d71f406a/nowimadijevifutenani.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/40fb34a0c58f6ffe0a19f90635232c7a/4444757995.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/69008039416.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d1847625ac8.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e63938cdc1---68365556915.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ca872d61---mapabewaxonapufakulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=difference+between+ontology+and+epistemology+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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 18772 bytes
SHA-256: c0ff7dd92db70618be5563e4eb0cc177ada45baf6c335d5f6008fd97538e36fe
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 11304 bytes
SHA-256: 26a56791b7e125b48f7221fe28678d1178eada709be6a3a11f4da1f7a3352d58

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