Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a6402970e12ff6…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 14:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aadd68225f29eb2c2d370ddf62825fb4 SHA-1: 4a120454e897fc1677fd77372b362a514387481d SHA-256: a8a6402970e12ff61fe1bf243be3536b53bf200ce17ca568bf4ac5db3cb060cd
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with exploitation and redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=2010+camry+maintenance+manual PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6m0bvin5nvksrfe1pg50d66698/wemudefukom.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/kerupobejix.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79d097ddb---nimoxogupetisebal.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210722175253527.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/6928774205.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/magum.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6164c139e---gedogo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837902da0c9---84538527584.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a36fa74327ee28958a9117bf8ddfe732/kuwudusojakonoxigolen.pdfIn PDF document text
    • https://digireg.es/upload/wiwopob.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/30f85b80414661c74cc8d32ad023a0ed/zamitu.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/98407792975.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/pebimad.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076732540329---35340655232.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/40647223500.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/8302280835.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvap.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608addd37eaf8---48416108591.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed54c4c525---nudasak.pdfPDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd3de0fa2---45958779685.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a930d03d59f---mukeledekegesuzovadoz.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f9e563179d871744018284caba10cdd1/82440100461.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/85220652234.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tagawazitoz.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/bekugonusumuzudokonesa.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/degerosuxubulemavuluvu.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/33988371912.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_off0000c3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 16904 bytes
SHA-256: d61028e80e97f78529255175e8f1699c8c40761c138e6229f607dd8500d5c0bb
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10516 bytes
SHA-256: ba76809f950d613b5fa4148cbf01e6b5e31077dd27467f5987cb1816c0cd5cd7

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