Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae51ff907dba7910…

MALICIOUS

PDF

81.3 KB Created: 2021-06-29 02:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fd4480067f7b6f0abf0f2546bdd95555 SHA-1: d8785179dfdc33a00a0015eb8c38eeb7cfab9ef8 SHA-256: ae51ff907dba79104b86c95b6c0eb3195d76077666cbd42f500cc648fa464872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0877f2b4f---fefewifovowagezikuj.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df04e505a---28918567180.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/kvc6b5a5ggslok3itfc26brfoa/87645925288.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b0f22c1d407509fa133c84a1f2e29c0/53494143202.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/detudadepug.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81f274b95---13792612730.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/1cbfcdbtgge0oooqui9db30es1/duvadiz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608633998e61a---32292305478.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609831763ffdf---kamaxisexumukelosolo.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/zeruzajaxafiwubifa.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/16017276635.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/3llf6iiqeugj6b3bvln5u8vi27/25961000343.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8146633f0---xeminisugixosigusu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9abf02b0a---31901247645.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/levanagutilesolobogina.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pefadig.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160705a1b1c4bc---solutibarunurudilo.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/bonatilixuja.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/51454057135.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/78tdpbq2oedqbtskdl28fqheq4/57524942341.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d31ff256e78048705aa3e0179dee81ba/tirikuwotesutibafanexop.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d28b4f6047e0fe1e804d0101855ab77d/78656503786.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/marewabozegitofogiloko.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508e02a164---74775980137.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0a80483decc600b00d28649c639e651b/gotizawarazesedexagap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=electronic+library+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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16740 bytes
SHA-256: 7d728a58a2ad966c65ca8e3f6bcd7ea45353941d38e6a1325d9f6d5ba66f2473
font_02_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 10680 bytes
SHA-256: ec31fa51580c3b7c9f4389380364ca74be7ca3fcf0591a1613aa703839084e77