Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7962ba2c3d44872…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 19:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cff10188c8e42192ea520f9447152f5d SHA-1: 02af360ae11db3cffe564d047933a7e928585d26 SHA-256: b7962ba2c3d44872143b9b4ed1babd517d8daa013d1b95c29c45bd5e800ddd75
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://abwcolley.com/uploads/files/67588117248.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e955791bc---zerabebebomiwerodal.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/db52530f2ba75f40523f3e0a16ee82bb/nadekozedetajebadukobe.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210716_86ADABFCC2804F2E.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/38364825960.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e94500fc70db243a56db253f2a2f5b86/dojane.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52735665136.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609635b7c57e0---vibam.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607901b8b6e5b---soviguzonoxinosujo.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/831681534.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/97330052940.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f6058a0---loforimebefoxojawubodi.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/23506842386.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/65958996451.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xowipeseminisudaxavejab.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/muridu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd8c62d20---2980415335.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/guwanilogujenebokakebino.pdfIn PDF document text
    • https://digireg.dk/upload/xirelelogunesa.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/jopadekepeju.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d14990b90---zawuloteguwedukodo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087805858408---3986489901.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/vizesasibogobesafigukumog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+to+word+redditPDF 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_off0000c439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC439 9952 bytes
SHA-256: 4afa80f4494491f151ab5329a3b2a96e75216c29367bd15a7414a8778a46748a
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 16136 bytes
SHA-256: 0ffc93cfebaccdc9f4e782739c105e6fc72930fb40c0fd4ecda49b44723afc06
font_02_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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