Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0ca495317b4580…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 07:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85a40e13f5bf1bc5d9d84b9d5a40f023 SHA-1: 5e81988001c4f936853a41ec1553827312154455 SHA-256: ec0ca495317b4580fc8b57087f972e0ddd433b2275b6fc1d3a24bd96bda1192e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://otohonda-phutho.com/upload/files/mefov.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e4119c31788b23df4c2f5e91f79e0ee2/pizopulaveganorexubimuka.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9626e45ce---90521624451.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1a0f29868b0df0071174844d376d0681/70616957748.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/kofekenezugigexepab.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875c7b9e3e9---pupatifaxif.pdfIn PDF document text
    • http://wenxuezj.com/images/File/470190579.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/botupugezelin.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/8785152605.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/fedubodeza.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/22982756641.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/22893926989.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/34945000582.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/30329725860.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094322734000---78137723915.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/69932422024.pdfIn PDF document text
    • http://baoveantam.org/upload/files/51685475707.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/57122430561.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/24386982369.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jotoxakogivez.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b349c69f95cfde9e2f6430c7d793d621/95864652240.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/63434537375.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6cb8ba553---6696089617.pdfIn PDF document text
    • http://eventechsite.com/files/files/lejesusavenifigeb.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6179dae349fd1d1345c7ce806223096b/tanaxa.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/rewuwotel.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c7ab79f5ce757be9ec6cd701eca01e47/suduwojuxawoxafega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2016+nissan+altima+parts+manualPDF 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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 17824 bytes
SHA-256: d9d59e3d6f5edc666e53dc6c2f691e4945a4ecce7bd2fcb13573f418b8a38e97
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 10628 bytes
SHA-256: 20ea9006b25928608339ea77a9305d6221e6511779ef524acb5d45acbbfb8422
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1