Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82ac0020c010089…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 10:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01abb00ed91eb3d046116151a89d5be3 SHA-1: ce4b10a784dd0764e1f307fb53d7a2cfec1ff902 SHA-256: f82ac0020c01008912cac7b69dea455281e1e11fb063b4762084bd612565d7b3
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to other PDFs hosted on compromised or disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://nhasachnguyenvancu.com/Images_upload/files/35250187347.pdf In PDF document text
    • http://union.travel/ckfinder/userfiles/files/18656433623.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/km80osa7htm9hl355pac1nnll1/gubasexake.pdfIn PDF document text
    • http://greenld.com/userfiles/26057942339.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/43723221514.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/luredaneruvukinala.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3209d419---nevotajibibixobolaz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd204b87e---vatudigubewevalud.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/krpa10luvlajefiee6q1pio2o6/32306701706.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3b14a30c9ea8a072c6581a94c9a079dd/fitaxuvajixogeve.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/zazuwugakaxaxugetinazeset.pdfIn PDF document text
    • https://noddy.nu/images/file/laranenowunitizome.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21ed5b5175---84749128684.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387a16c242---22639296649.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8f46a9a3---22100597251.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72d763648---zolozobimutotorog.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/74538421235.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/58625619923.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/63891353806.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/1650034371.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/41901270100.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/16417480658.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/49305556714.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5b921350a---rowulax.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a93002401---rutunosed.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d404715c4d---80801302114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=punctuating+direct+speech+worksheetsPDF 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_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 11024 bytes
SHA-256: dafa7ddd988a286ff8a694e8dde8674d939cdcaa1196c8f49a2607c5cc90d447
font_01_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16876 bytes
SHA-256: c3330d585c3d8fcd7cbbd0c9585b36f517b4f297e16b8f22b1b8785063b9453e

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