Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309b489c9a891d4…

MALICIOUS

PDF

99.6 KB Created: 2021-07-22 10:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 52cecae689f2f2b4fa3a745599482d6b SHA-1: 49661881c85ef7e3e36d813d7091f45a8ba765af SHA-256: 7309b489c9a891d403887b96fd55275c06f5afa58747e6a36afb925a872aa678
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to other PDFs hosted on compromised WordPress sites. This suggests a phishing or malware distribution campaign. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d1929344403ceeee7f056921614d28be/56898521265.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/94l3adm00h9jidkc8t0no5bij1/kapegigexopadolexuke.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a676a590da5---sijidowamizex.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/65261c359f8037ee35f595d46c2225e8/tuzojade.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/81489931503.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/vevorojudadajudogab.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/046cac6fb2012e80be29554cd62acbf4/begagizogeseranolonag.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/97613086677.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/93924505273.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/faxinuwuxevotitumiwujare.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/hrjmui7jd3aooh4l7j4n8r84f5/zimejigepulimaka.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b249ba9bd9c---lelok.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/46057262601.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa641846f---tomobepimixinukodova.pdfIn PDF document text
    • http://crediramasrl.it/public/file/dupakemasamir.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/14c2cfb25ff1ccf949a88062c3a783f1/dozapuwo.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/jotajonigaxatasew.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2a38cc54f1e94fff94ac8defccc6c6c6/lefopizatakuxufe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cea005a9---11557603511.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/71871595194.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca4486f3b---55644526764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mark+6+commentary+spurgeonPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16624 bytes
SHA-256: 47d67bca6eb538045622d51ddaddc656b0928d2d85835c97863d9c6ca9077543
font_01_sfnt_off00014f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F34 11048 bytes
SHA-256: 1953c355fe14a8b120fa137ad8c63a8f6752576025f309aa1881a9142065b00d
font_02_sfnt_off00016915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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