Malicious PDF — malware analysis report

Static analysis result for SHA-256 946adfa77dd5f32b…

MALICIOUS

PDF

91.1 KB Created: 2021-07-18 12:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8fed47fe7c92b5bbeb25309cbb8dcbee SHA-1: 0afa88e485aabc56de74e10716ca32b4c8346b91 SHA-256: 946adfa77dd5f32be3451e7d9b2a74eac6adc6f1718c738d111277d3549c9b2b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress installations, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of multiple external links to potentially malicious content is a clear indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fbf5a335b---65775393659.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf4bf51118---nolirox.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5bd6250ed---zurisukupefotegig.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kunaliji.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090a08ac72bc---71992293668.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ecf22f1cc---90562358703.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061d5c6d08---vorejibesatelurijed.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d3258cdccca---84604413810.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0addab2d5---3913326602.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/rikemumewufemutex.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/58t95d6ou934omo59ch582pu7v/kimepaxipivokixivogituki.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/juwodejimokasutakin.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/nuvamibegupagewebita.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/65928179247.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a41927e8e25---9002248601.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/92982149391.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f821f21f83---35833014481.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-7/20210707120243502831.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ie39vadj9gul97paetqkvmvfvc/nulokebesejivizimokuxunab.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcbbf1289---parowalup.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/korewip.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/66407920119.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16097c116b62d8---32705659204.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/kosegedozefabebelakikir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kind+of+storyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 18168 bytes
SHA-256: d180f32537c972f7b15804822a0391794becb2146100d657e11b15f4e14fc6f3
font_02_sfnt_off000148c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C2 10112 bytes
SHA-256: b2930494625caa3a47fb96467265a5e648cf370fe49433ff69613c4f53ba180b

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