Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f4ccd9e0772020…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 07:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c011107242cc33af834bbad234688ad5 SHA-1: 31347fb64fbe7655ca516f7bdd5ce58331235175 SHA-256: 08f4ccd9e077202065af4423d56209296e54ad8e324d815bf4c8974558baf4f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs are consistent with a campaign that uses compromised CMS uploads to host malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=innovations+in+retail+business+models+pdf PDF link annotation
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/710588f448a716ce4c9b303fadb19553/78093568742.pdfIn PDF document text
    • https://senhewood.com/d/files/10745798930.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b625c9115c---61229898994.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/38416561571.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9dddnpit9tb8p6bs66bj4kits2/70790556034.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/didasuwunovapimokika.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b045ba666b0---famobenekupimoweroj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7e8b1d15---49406455076.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/00bee76d9f61b7db6f2c04f2dd441946/91388811784.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/7526080746.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/65750662549.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b054c4c924---salojogetowagejegufo.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/wevodira.pdfIn PDF document text
    • https://kawanmto.info/contents/files/15143695646.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/82352594793.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1lr61e85sp84gopfg0p8jos90j/71295775374.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/98212935879.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/56870136505.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/galomijaro.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/vaxajanibosapa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1c3254c74---19759639736.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/23388077177.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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 16400 bytes
SHA-256: bd6688c2b0dfc45e01f51245ecb1a071083e98d805a46ae10589c73f1aa5e9c8
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 10916 bytes
SHA-256: 8e8e097909ffd94b17bb757526dad7b9bf2563a453f5468b2319dccde2965979

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