Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ef9c6d83cc2708…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 15:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf19d3169b7bf771f5bcdf52e3fd9fb SHA-1: abf87e22257f318eb5360a94529d70e450762635 SHA-256: 74ef9c6d83cc270884385bfad07f686499fe611eb04587aaeadac2bc4720c0d4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting it's designed as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=how+to+make+my+phone+a+firestick+remote
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06dc0f516---54165907728.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb967afa2---vagutuganaxowamajupabazev.pdf
    • https://tennis-samara.ru/img/file/wewexerefidirinomutufona.pdf
    • http://zh-huaxun.com/uploadfiles/files/20317566493.pdf
    • https://safetyhanoi.com/userfiles/file/23875929682.pdf
    • http://electronicaindex.nl/images/uploads/8142365175.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/21404cf82dff93d3480d41792b43ac63/2578212644.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/11093580219.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/nejafinutewagavam.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902054954.pdf
    • http://mosme.org/uploadfile/files/faxotaleriweku.pdf
    • http://rkmaster.ru/uploads/files/5370168102.pdf
    • http://shriadinathbank.com/uploads/23636990353.pdf
    • https://dobre-akce.cz/media/files/file/xivesibubasaretoko.pdf
    • http://piemonteforyou.it/userfiles/file/75706683354.pdf
    • https://smartstone.ca/userfiles/files/61019565230.pdf
    • http://nscenter.cn/upload/files/61602661400.pdf
    • http://bdn10.cz/files/file/wegifalaxejudupiv.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c4eaa482---19301609765.pdf
    • http://bidadapatidar.com/userfiles/file/kotikebalokebanizefe.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/muzexosifanev.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329b54c710d---81668482312.pdf
    • http://auto-spec.ca/fck/file/wevupukeminivozanenasa.pdf
    • https://sicurezzaips.it/uploads/file/zimud.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145562300b10---58591030745.pdf
    • https://xylemleads.com/userfiles/file/83883504244.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
font_01_sfnt_off0000f711.bin
7dc81bb673ccf670b218a46dde5ab826cec6eb909366010eb1cb1a7c66bf6827
pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10980 bytes
font_02_sfnt_off00011071.bin
65f209c16b99dc019fc3cf24bb9fd15d5f08f0581db5508073b2e1e51b6da67f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 17464 bytes