Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3ab80180e473ca…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 11:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f398c3e18179f73b31506899a2080a19 SHA-1: fcc7848964e8bc6214c16441dc36821314e65ebc SHA-256: ca3ab80180e473caf41811a5d1c1961f413e2bf3c8359803f10e19957cff3d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=sequential+file+organization+in+data+structure+pdf PDF link annotation
    • http://nirmalapublicschoolerumely.com/userfiles/file/35708269278.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d804knhf86o74mvcelnql7n1of/lozib.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3084fg5uvahaoqocbvkt67p3ek/jafujitenifegebimitar.pdfIn PDF document text
    • http://lyshiying.com/d/files/36886357928.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7247f2295---14489928226.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9681ce544---27400338353.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/04fd58fa78099f2306e4fddeb69cac94/99116472758.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd19e3a559---devilalovidilimefoxez.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2361c3ba84---moneratuderos.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210718161913143.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nozenegifobubinis.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210619_03F909B13210127F.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/47838553012.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/80813255988.pdfIn PDF document text
    • https://tavio.ru/files/file/57253038015.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/p46buu8feriac2ghi0um09hl96/50972036416.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/97560122332.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7d58e4a4---voneruzowilamelojegimagad.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ade9fe515308e38685a2b436848c858d/nipere.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/9919420700.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f99bf63777---kanenodideragewesaz.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/porubawog.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/roboxitilewaluvapezeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 15848 bytes
SHA-256: e98f96f39923238cb99ec84889d833e4283df43c3e752cde0a85b974d4133167
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 11176 bytes
SHA-256: 48644b330ef0f95004e07f0e6638126e13c3b5b708771daead7d4870f82c5dfe

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