Malicious PDF — malware analysis report

Static analysis result for SHA-256 be852d3c6073f8f8…

MALICIOUS

PDF

96.3 KB Created: 2021-09-07 22:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0974998a4f4127c07c01bc179c64ee00 SHA-1: b6a9414082cdd2f60c7fa56c4a0fd07b239524bb SHA-256: be852d3c6073f8f82477b06a1dd6bb9eeb2ecab7ec6cc059b015d15a3f7f9cea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended to host phishing pages or further malware payloads, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6f2ea1e0095b6fa11d2dbe2dff19c111/lizupodogezuzofav.pdf In PDF document text
    • http://goldnumber.info/userfiles/file/95333397647.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/79598673980.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3acacd88c---vuwuxaletakix.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3pd14c6biuhbba394bf6pivh94/10762279629.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/jirfh0l009ubp7kef7jajvs5fj/zufukidorovawokos.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/gusadadulagaxus.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de122f3149---38742357202.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6827e257059fe0d9532bb6593312ef8/6792641142.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/15423112557.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gifetinosogulenifeledit.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/42355694078.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/53835416836.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/marowepoxevari.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a934bd0f5ca---60763785565.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/fesivikikuwumufopimu.pdfIn PDF document text
    • http://crm333.com/documentos/file/fifesopujilosi.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/88559526747.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/49925425429.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce81d5924---55053103312.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/83ipt10r1cq19nrfn50ketuifk/duzap.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4e40vvcdg3d237f0ge8dsh0cvr/lalezilob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=summarize+pdf+articlePDF 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_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 18304 bytes
SHA-256: 5a42ab0f781588a53666b6380475e1273c7bf789df4d1df1bb549c9d2fefe3ac
font_01_sfnt_off0001432e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 10624 bytes
SHA-256: b9c6a5067eef0eff8ba8c07c7cf6b70d8f5a72f904901fd2a2fe6aebc1b14a98
font_02_sfnt_off00015b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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