Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c48502dc37a8b7…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 04:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b16de95bc013e70e3a47fbe8f7f538b2 SHA-1: b7251d366d525cbd5af305c6767ba03d7a06890d SHA-256: b8c48502dc37a8b78e0e961d5af0a2a0906a947f1731b69c956151376c89c4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress installations and are likely used for phishing or to host further malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://nomylo.ru/uplcv?utm_term=father+bear+comes+home PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5b97caf---petosazepepakones.pdfIn PDF document text
    • https://aildf.in/userfiles/file/viruzudawududaw.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210916020017.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/43294727997.pdfIn PDF document text
    • https://basisangka.com/contents/files/zobiwutowag.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/72527569253.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jadujuzejiponemanud.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161437c1d3804b---72684851728.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109262213416134.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/16158f711ac17b---fokowonituxaguwewu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161402d6af3ae8---kiregej.pdfIn PDF document text
    • https://maria-galland.ru/files/file/zomebumudakug.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5089866e---wafiduzozatonogavejuj.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328dfc02021---88334379114.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161483d2409e9d---jilasoguforilifosowi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/25057868721.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/revaxobugu.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/wabevez.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/73595075441.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/sejubega.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/fejewuzevelikarogivo.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109030453533689.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9673d5686---pukiwimukegedejolas.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/17265848034.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/93327896700.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_off0000b229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB229 15760 bytes
SHA-256: bf0fbc6fe01a096621513d7b6059816ad381a53cdd3265d77acfbb334077cdee
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 10368 bytes
SHA-256: 1b81bc53af54dbac4fee7791670d42d5f0e1223077602f55762cc529c3371791
font_03_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 2228 bytes
SHA-256: ca34b8e6398845b5ded729dc127edf91d536499b4ca608b44af24dd39e056d07

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