Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb52b477df3d6665…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 20:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 25a67a180d122e11cee6d9c6c3a2c258 SHA-1: 30a51770b1785ee0c4694b353fe29b8ed1793530 SHA-256: fb52b477df3d666543a950423f52572fed68600d2a4d5d96a969ac73b215e296
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/44791508060e08af340aa4.pdf In PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/76339674031.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sbmpuvfr805rdvlur11lnkr75c/wilisoxawefowizejub.pdfIn PDF document text
    • http://amdind.com/userfiles/file/27558732696.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e3b111d3edf550d2e57a746ee635b0f/keralasori.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/rojitubokizo.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/26911117194.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/82997714179.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/wesinarovimoganexovazu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d883e0739---12382142086.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/lorexuranax.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/lunidugi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bb64a7ea---lajumori.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5c962753---dudosezuwaxez.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/ruzetawale.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/retegibu.pdfIn PDF document text
    • http://kaies.cn/upfiles/21081423053083408670racz.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/23988517064.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/578800a5f7fc9a8533ba3d8dc6ee7638/xevefunagafoxifofuj.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/nijaxegujusa.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6c740ba9---47715343224.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eadcccc68c03afd22acd024cfe977e9a/rapibewulugimivufixe.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/59674492921.pdfIn PDF document text
    • http://samtekelektrik.com/files/zorezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=zoology+12th+book+pdf+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 10792 bytes
SHA-256: 80de6d22c7e7095786a351c208681c2d1b44a6d655f23ea37b11ac17b902e341
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_03_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 21412 bytes
SHA-256: d040fb53014258a72c99d3b47c56a121e61f2043426e04627366baae47a22096

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