Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dfe2d52432067c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 01:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6ef860a9779a8b6b3f3e657e9a77b98 SHA-1: f6ffc5b0b5e8c1db9a371183dfd124e28a98c6aa SHA-256: a7dfe2d52432067c869eebbe83e2133e26e4bb05bef5eb3161d9e3efa40cd30f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255e38300d4---17682171886.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6tbv11dds9tl5ua5n14t0etrv0/15730245128.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef82a95496---78337905693.pdfIn PDF document text
    • http://swhos.com/upload/files/xuregurabifedaxumupiwu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb272a6b3---47219226406.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/voxozugibovawa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49564b779---20252601338.pdfIn PDF document text
    • https://carlojans.com/cms/file/lobavuvipivuxikomelifas.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/vitisoz.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/1859931426.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/9252690698.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/47937466931.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/46270480634.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/48577b80c439a537d9a6e9b351302f1b/23581107459.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uim5hsrbahs9fg9amc8r3kl63m/depuwitoge.pdfIn PDF document text
    • http://midel.me/userfiles/file/memume.pdfIn PDF document text
    • http://kasargod.net/uploads/file/gepobuwe.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85c6e0d3841779e109f9969fdb9f7e64/pagiwulojabowiselevokawu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac5f8244e1---tefibok.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5769b88324d5d85e538bc19d94d1075b/jesisito.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9lkvte8atr4n6gjsd5ad8l9lom/16746655950.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdb2e3555---93329395177.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/72490546039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ziyarat+ashura+pdf+free+downloadPDF 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_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 10856 bytes
SHA-256: c886c1c97b7c90e7fc1d50cdc90645b6a225b73b22a5098defe2cd0dc75b4218
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 20132 bytes
SHA-256: 407059efa7ddb67a9002a7d059985421fa529747303c089f055759ad171a071f
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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