Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6b2e4b41cd0572…

MALICIOUS

PDF

86.5 KB Created: 2021-08-15 05:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99e883316a0fabd89b8bde2fc2013f04 SHA-1: b9f7a6df8c26aabb03aad956dce10ed0c11e774f SHA-256: ad6b2e4b41cd05721b6e5ff0578a0ce36f5c34f11ef341357b1594913c0ce66a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dfaaf0906d6259cc26259db7a67b4571/beridome.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e369efe1f2e---36871183230.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d47fd5c4e5312d70d998cff555edf12a/ranusijajesuxazoxujisowub.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/vixanuwowofifudiku.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/fimopifakodukilowaxizuraf.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/48556932015.pdfIn PDF document text
    • http://mebco.ru/images/file/wemawujixapopitapu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/81799033799.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/62900587258.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/77923749542.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108082308373579.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/3da1c2a33a1efde3861baac64f06e33d/97863820122.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/rovexemezuselepipogataweb.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/58504606745.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/507dd66c0b64dfdd0f1b55d26c745b5a/66435406667.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kitemakaje.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/polupopodotere.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3930935157.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3u6v0iu6ha11n9np25g6kp3mrc/xijufifaxutadamawipozosup.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54243b9f9---19464580351.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/gamefowuletumunarenevodi.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/pegatupuriwowivavibaxo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/57f00c1417383376855f9e52f0919b42/96239629574.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/xuvez.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/mumofegekemokunepikij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sirloin+tip+roast+slow+cooker+onion+soup+mixPDF 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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 17112 bytes
SHA-256: e2c86fe454cee32853e134deca2dd65743128f869636e265681f397030ae5579
font_02_sfnt_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 10988 bytes
SHA-256: 900688cdd815d7a5dff88d7cf2fcae9295fcdcfd45eebfa4a817508f9b90f163