Malicious PDF — malware analysis report

Static analysis result for SHA-256 35db687e16dd5ad6…

MALICIOUS

PDF

94.1 KB Created: 2021-08-05 18:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb51b41e2a6e2d65c208e77228b834a9 SHA-1: 740d8d2a7475c8d2d26872399117e4132a50e435 SHA-256: 35db687e16dd5ad6eea2a93ab8acd84c8a45cf756e210b48ac476000b9b81979
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely serving as a distribution mechanism for further malware or phishing content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://umiyawoodworks.com/fckdb/userfiles/file/duwixajisatifigezabomawe.pdf In PDF document text
    • http://1careglobal.com/upload/files/nagebimekexokarewagi.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/pamulited.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/vuvasodonofumofifexux.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/10809910152.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0816c3d7cd---xewevidu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42ee6e05e---4919483657.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0c9128a19bfdd5dcb0001274f5864fa9/49405151855.pdfIn PDF document text
    • https://ultralloy.net/upload/files/wizozet.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/88077086988.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b580c12ba---68678430067.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/gewojujuzufejodenupivaro.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/60310842279.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e8400706---45184106577.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79df6bd36a---62487251199.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/48581284223.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/sewesogokusa.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/44455640469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b521451eb00---44403917043.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/55393271744.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7386d1868c---vegokegolewuxi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160721f3067bd3---69149660835.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc18b7fbb---kanez.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d679d046236---46455102453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fisica+volumen+1+resnick+5+edicion+pdf+descargarPDF 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_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 19260 bytes
SHA-256: 7461158530111ded6701c54d3b10ff90b874888bb20a337ad4bb07709e4b3f6b
font_01_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16084 bytes
SHA-256: 629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de
font_02_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 11288 bytes
SHA-256: c659b62d9db71dc6a32be6fc02f94e43d2e670c74c6a89a13ad5ceb72d96f294
font_03_sfnt_off0001519f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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