Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53cd4f8a70f2a2a…

MALICIOUS

PDF

85.1 KB Created: 2021-07-24 20:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40c5cb9ff478156749349fa99b3344d4 SHA-1: d6efbda9908be104ea2d099b37dcf2bca2cf502d SHA-256: a53cd4f8a70f2a2ac2faa754ec25df10c0936e5e474c5159d5be140c9e143208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to phish or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2uvq9jj7kuq8f19qlc18jcptv4/manafivenoxijepikudazak.pdf In PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/xujozanakedabowuteva.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hu1esvtmp8865dq53sh0d7pta8/40060423683.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fc1eda8e403628642c38a378fe4dbd84/86004364584.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd4btfo573sojsqg3hg44ciebt/fenakarakulaful.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e037599f996b8ce3e12a94f219bec802/wurugofavukigebapova.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/xanejidutobavig.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4925a3897554a128f96f64558645f57a/659310810.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160879dcf76507---81302145861.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/zatejud.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/41790445431.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67168081542.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d23817b919dec10a8fe6ff793975ca69/56725082620.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ef2e3308---36444888125.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/bojujovomapivepasamasot.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/33e9617dd831d0ff3a1758f3ef40bec1/33247602036.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/midupofepibelar.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/14d8a2446d833608644cd20456913384/78088997.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/fusilokulad.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9rtqeqk3ad5sase1jsd1rfjjq0/ridopadoduwerugonosevek.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/db85seeo5s1g16j3ab1121dp0l/32995579627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=call+of+duty+ghosts+unlimited+ammo+cheat+ps4PDF 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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 16844 bytes
SHA-256: 167f5a0c37ac89aced8f54f67b373f2fe0663434bcf5683c51a30f3d0e47e54f
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 11288 bytes
SHA-256: b11078520b24bd7c9b8ffd315dd4f30c78da85767d1d5ecd4ef185ce8c5fd92f
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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