Malicious PDF — malware analysis report

Static analysis result for SHA-256 afadc25db17a193c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 18:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baee99e7b7d0631fb06b9e9f9112b5e1 SHA-1: 6c500f8bc63165c18a7cdea9b6515cfd472d8969 SHA-256: afadc25db17a193c82d9a87a805bc3ab99e953a0cbb768e6ba58a3036cbe6949
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL distribution suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://xn--o79av69abka850ab6c.com/upload/file/202106222202167765.pdf In PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bef2ba0fa80---teraloz.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/menonugarikik.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/897mcnshjngir42ko2lu29objo/55101903676.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/46822450645.pdfIn PDF document text
    • https://computerzone.pk/file/84808271206.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088e672ddd38---16014425890.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161114cb07295d---nasinagokepefese.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084f9d8887---labuvepodevidokezode.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7ad2ca50a9197915c863a15441c9eff9/5626225985.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/razodimax.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mimesibut.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161210c23cfc7f---26991295369.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/86155122174.pdfIn PDF document text
    • http://vtaky.sk/media/file/nutebazamogeruke.pdfIn PDF document text
    • https://waroproject.com/file/15448835873.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1628053236.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/37145988527.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b277f1e427---83822760176.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/80967717514.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/vakebelebikurepuke.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16104f1ba6a382---zurad.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ccf65017b786d74c468066859f55cd8e/43168738132.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f60d314429---guvojikatokuzonozepeseg.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/53065430358.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e992686436ff2b1aa473f84c5000971c/60401251262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nms+follow+up+worksheetPDF 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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 10520 bytes
SHA-256: c81282e35f5f48487bd45f9684b7b6ca4d474e303e85dbf599963c62fc8fff13
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 18140 bytes
SHA-256: ee6494063e4668bb2697acb9c6f24ae3a05c112a98164dbaf625f81178c631d9

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