Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9dc1e836170a85…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 04:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c3b450633548958f897c685d6648b2e SHA-1: 11b8cf44040cc323d0e1bf3f4b1edc2e84dec0a5 SHA-256: fa9dc1e836170a85ec35f767853375adf3f6c7b045b87feddc2180baf7a54de9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure malicious destinations. The presence of multiple links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://architettoseneca.com/userfiles/files/tazojaro.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/metabimitazases.pdfIn PDF document text
    • http://yuha.be/_files/file/lomadima.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/87847891876.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b72b2d4326fd5a29fb612d7e1e9c69b3/32642992591.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/65384560912.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/tepekewazabutufipareneva.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/muviranoreriwakezeva.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2d7760f0b97846b0ed7dc8a4b1555761/nerojusoguwexudubebuxeto.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/jinidefuvuluj.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141504b208e1---5525566442.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460f1fd25bd---dikisokogaxax.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/44154567367.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/17165108969.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/91457674181.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/37445889433.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/554147200.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/dotezotofenojab.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/rukuki.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff14531266---foves.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/67300129068.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/30866240140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=legit+root+tools+for+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/90097778618.pdfIn PDF document text
    • 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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10484 bytes
SHA-256: 7a943275f4a7a244bfcf283b6955b8eb33ebcfd10e22186110910891d805691c
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 17472 bytes
SHA-256: fdb0d61a963fc332ed4720cdb8e2ebde27c8bbdfa27ce0e5c19f8b1d8c231e7b

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