Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8370b381c591908…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 19:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adddb9ffd3706dc044f6c1dcc7e73a14 SHA-1: 903e232319eb0eafa4c92c58fd4dd5a35fd3c637 SHA-256: c8370b381c591908cfa8668a24795bfa4465d3d00ca50b9b828ecbc5e3c6e33d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cc5c5ca016d1abf51a9145507752a513/tomowolezidafawetoka.pdf In PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/boforesikevifit.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sesazojavokejuzarosigu.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/nofewurujireki.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a966411a63---21946212439.pdfIn PDF document text
    • http://jcpingie.be/public/files/fuxag.pdfIn PDF document text
    • http://carszana.com/image/upload/File/45135123489.pdfIn PDF document text
    • http://strandedtattoo.com/file/ritexuboje.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zadenejoz.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/damamenidenenafajem.pdfIn PDF document text
    • https://zzwgjx.com/d/files/newidawezoledazajogutaso.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba765056b---fazurazojoxam.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/bifuvalada.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/roxewujewelumadugatemeju.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/gakokazaligefaforisof.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/33464577639.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/31797988531.pdfIn PDF document text
    • https://finliz.lt/i/File/28522302171.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/barutox.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/ribixutarapoxokarofad.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/45024534389.pdfIn PDF document text
    • http://mousike.it/img_ins/files/47621974225.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138577fabddb---bekegezefanowixizog.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/madutojozogosa.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/tovisusabisogotowolerek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tere+naal+love+ho+gaya+full+movie+download+720pPDF 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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 11300 bytes
SHA-256: 7309cabb99b1a767d39c71b33d5b535721d50b3115a4ea598a24f8774633aa48
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 18472 bytes
SHA-256: 6e3a4c46b8af67cf69e4c545cbc2c5f0cc5cbdbd8c3b83e08af389076f7bb778
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1