Malicious PDF — malware analysis report

Static analysis result for SHA-256 7471436bb6d67552…

MALICIOUS

PDF

104.6 KB Created: 2021-08-27 08:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf63c15e4ef5f973f8aa71c4a14285b7 SHA-1: 7ad8f584a0a1fcb3f4d825585b2c035fbf619e98 SHA-256: 7471436bb6d67552dbfb3b3b40c32ecdbd7bebbcf20576ae3dbf23abe034583d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm heuristics point towards a tactic of luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://betenagro.com/sites/default/files/file/pinakebufodejevutaz.pdf In PDF document text
    • https://sabunwangi.com/contents//files/xifiwulag.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/vogaxelogewalozujudaxi.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/83400668914.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d66d05712---lalekovunim.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/67509686049.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609445c15a68a---worerokig.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/93366349688.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/48966793320.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/8480786522.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/29pd4h38dt84ck269mi56gd01j/39358878180.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/wirivemiwukibovazin.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/uqfvn1ghu86atoe5a4p4jhhmv0/86139196599.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/26381677734.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dogajizubuworazutowura.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/da5e3491c9065ba5bcb86038d816d5a6/romobegegeses.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/l64b82e1clg4p6hiviflrc1k8a/fozufavikavoraxibegovemu.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/kopuligunavumerov.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a648de681c8---30267589917.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vesiganoz.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec8b8699---mupefapaluruvapidareje.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf18f03a2---41988271486.pdfIn PDF document text
    • http://fygl.net/uploads/file/290855316500.pdfIn PDF document text
    • https://0924055971.com/uploads//files/202108021704337862.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8d7c1342d---83481357576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mid+life+existential+crisisPDF 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_off00013556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 17476 bytes
SHA-256: e6fcf7b3eeb614872dc2fb682811037bc177544a37958f3f5a2f5bc62adbfe38
font_01_sfnt_off000161ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FF 10444 bytes
SHA-256: 44c3a04667bf9484e2c223314fb055a3b789f003f523ff0af0e0e286eb0554c0
font_02_sfnt_off000179cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1