Malicious PDF — malware analysis report

Static analysis result for SHA-256 4706535756fd2ff5…

MALICIOUS

PDF

100.0 KB Created: 2021-07-20 05:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f519938f8523c97669062f4616d6f565 SHA-1: ccc8153f9a3311860913f522d8f1a84c7409c621 SHA-256: 4706535756fd2ff56196a3f4cdf40e5d044f6e292bfa709ac0f9f029c396b229
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of numerous external URIs and link farm indicators suggests the document's primary purpose is to redirect users to attacker-controlled infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/38c3fae6f17a13d4ccfc2372bed2f269/talifuwasokumovevomogaj.pdf In PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/dubuxozakamilafifukener.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/fozabujuzivuriped.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/37060598795.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd5bc3d9c0---punuwov.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/c85gb8lpa6b3cp9eng3sjl58ip/xizigalipawuwonu.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/55298282960.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/46579585258.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ba0083a92a5efd3e216b796e2b537ce5/89390613496.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/46693621503.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f925a59bc8---28173472802.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85d0d6d009---voges.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48c5832e53f17f4716b8f0eca1d8de2d/pusivifuvogijawiviz.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/26849751360.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d6f3446eff10a4ef98def5afc0f5cfb0/xojibuxiwakebedexokom.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92934dd3a---51499069911.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1aac10ec7---xesiwufedeniwonumi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1dc901e4f6a3b83b7d4c6799f25ecfeb/7126636476.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/qlnob524uja7fi2gf2bsuvv3ok/92470452406.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e05534ddfe6ecfedc9f7d66e2afc4194/wemodubod.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fc6da71cd7df8c3d3463f4dad0fc6450/kibuwepomovato.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00eb8d5551---2692145687.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c77d7bef2bb3aa622b0fb696948dc97b/13902477199.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4707d172c---xuzarujemepemomewide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=practice+counting+atoms+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10912 bytes
SHA-256: 6a7d698e001641b53f8fdb4b6b47bbabd7cf37edf388890721f790fa2cbaece2
font_01_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 18480 bytes
SHA-256: eb413e1a566882480dd88f7d20c132046464ffe2c0ba1db1b209e1d69003229a
font_03_sfnt_off00016a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A96 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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