Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8033812f98c4717…

MALICIOUS

PDF

103.7 KB Created: 2021-08-07 01:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0022afcd6acde03a4c8cba5bf73acbaa SHA-1: e71e172f0d74d2437c5b191be800679e68d0087e SHA-256: b8033812f98c47179e9738a1273f72f150f142e78cdca11f8e65a047861e8ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://synerhu.ru/uplcv?utm_term=geometry+dash+2.5+descargar PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d598c7ba2c---50735854988.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/58985277959.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/zidonukoroluluzi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6dd3a2202---64692652265.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97f27d27d---gojofula.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/nopefenatonon.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5067f0440c2a321b7bac4f543104559e/vifafosawolekifidivinofew.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f5548b6ed58---5711737745.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/2fabeb2a235abdac5ba21c577052188a/muxamaresuw.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/59722110794.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e531a137---54589115182.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cajbhcam46k95sheij0aapfc84/70095348369.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/noxabirof.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gnp1a9utq04teil35svcl8pl36/36049272629.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a7072bb---63533130012.pdfIn PDF document text
    • http://coumert.com/images/file/labogijexixozumos.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210613/file/16235485857901.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f45a02783f5---gunobejavi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5c3632a4---nolewiwuliberofenijabiwes.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/49105499382.pdfIn PDF document text
    • http://www.520amis.com/upload/files/difobutogizadesep.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/patajeliwinukomotamesevu.pdfIn PDF document text
    • https://premiersuli.hu/files/files/maxenanix.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/41881789033.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cba390ddc.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 6128 bytes
SHA-256: a3c65e1d468e195175bd1cafe81f70336288d2078d1e1d9276f964033cbc6232
font_01_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 21580 bytes
SHA-256: e383726c582e4afaec6fc6cf071c60f1764b4f7e757fd9f8fceedf84de6af931
font_02_sfnt_off00015d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001752a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752A 11048 bytes
SHA-256: 62efc8e63a48b6b87f26b418270339a3d44f5d0c548fd95390353bb53ae8ddda