Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9242b2860c0d712…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 17:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69df1a6421062bb811765536f8a7e915 SHA-1: 76399cd65ae4e36e0e46dea5c44fe886dffbc7ce SHA-256: c9242b2860c0d712064f6252579c296568bd3a5c4398d80d9ce2eba7d2dde1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents as a lure to external malicious sites.

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://dobrasekacka.cz/userfiles/file/9802586727.pdf In PDF document text
    • http://yingtailong.com/upload/file/210917122227216907gjtmh03u033p.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/84326616587.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/zowidak.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • https://quizai.com/uploads/files/jafixiz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff25b19ba---tivabiranoneduvewakuxo.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/gewizalobunebuwozux.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/sugimonowowerisiromedewer.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/pifotovofagirixijetojiriz.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/92718243723.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/88495258212.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_48946DE87F85C5F4.pdfIn PDF document text
    • http://potlista.com/file/files/simorabonopajepit.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/80726436250.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vusuvetusubo.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/3927753811.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/602d8346402386a4eb77c66edd090afc/fepamejetutawimob.pdfIn PDF document text
    • http://princeverma.in/uploads/files/48305306342.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/xevemonakuvuwowufu.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/31129452484.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wesevikijuk.pdfIn PDF document text
    • http://merwepizza.com/upload/file/tanox.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wejibuxevegedasofas.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/30195479446.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8c599fcdcd5f049c436ee251ee960803/fujizuruj.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/49496326893.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109060746554027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+gingerbread+to+kitkatPDF 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 10424 bytes
SHA-256: e1d5ad627fc33e3d13aabcb2d456187c973873b05bd12ce9b3585e23c4200e48
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 18480 bytes
SHA-256: f8c41af3aaf583bc7cec6acbf6e66775a31557936ab723a05ae9b0d2a1c5c80c
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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