Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03ab6dada049288…

MALICIOUS

PDF

74.0 KB Created: 2021-09-10 10:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98d5b7ba9d4293ecaef0553a969b5e84 SHA-1: 9c87a7cffd79093acd4bb1d481bf22da8c17385b SHA-256: a03ab6dada049288456b8dd6e3ff3a918fede7862cb4eb1de0e47bc3dd877068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF_URI firings and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://drafthe.ru/uplcv?utm_term=vidmate+2012+install PDF link annotation
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/lozibuxomupetakarulotaka.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/zodibupomedotagozabi.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/43170411056.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/nerebovanipub.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/40829446281.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wozomiwelarew.pdfIn PDF document text
    • http://cartopack.be/Images/file/ditaxupokazadatajuvivalu.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/jokubezakaga.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/senikafiz.pdfIn PDF document text
    • http://webs123.com/userfiles/file/26953190963.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/gixodudokudigazuf.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf92b7d45---wuxarix.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/2728242136.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/47836432152.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/212129957.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/20053323773.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/viduguzuzafife.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/69224041718.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/52856747850.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a5127ea3---77223416218.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/wadibu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e2ro7l5megsm91oibilkk81l6d/ruwogeloz.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/37475345657.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_off0000bbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 18212 bytes
SHA-256: c957dd8d5cf7acbb5a3e4314d1482ff97489166ccee103cff2a543bd74bc102b
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 10452 bytes
SHA-256: 1d151fe3d0ed47d626443dd9b8cceb4cc9112e095171a545f1b226cf1cffdd61
font_02_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1