Malicious PDF — malware analysis report

Static analysis result for SHA-256 776ba6e984cd6108…

MALICIOUS

PDF

89.4 KB Created: 2021-08-25 10:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aea16565cfc895c73bc451dc1b9d83c6 SHA-1: 24d60c372734cdfbfc906a21edea4f3d86b7016f SHA-256: 776ba6e984cd6108e42b7c85125e90e5dcb5ef2440f1f976e0ca3748d528fe39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The primary function appears to be redirecting users through a series of links, likely to facilitate phishing or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=top+10+tallest+towers+in+the+world PDF link annotation
    • http://savaksangida.com/resimler/files/zukosalarikexowotewaz.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/bavinumuti.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5cef138f661f577b77b48ace2cc09960/19096697114.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/bivoxakitixowebisuna.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b1bdd4768bec4c2210501623b3c53679/14106019764.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/af206738676497d07422f16da78e2f32/mavep.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/jodazi.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/33963669538.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/48986714342.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9b98d18359fb00faa18075b1c9e50374/sabusuletifanusunabi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/64203424563.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/55816205543.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/20004984744.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e611a44885bcde6e5668335a6d48b97c/noxisasovuvalafezizerebil.pdfIn PDF document text
    • https://yellowstonewildlife.com/mozopoxufu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2140dc20---96558214664.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/79f01bc192bb6a9de7841b63568a58be/78210213050.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/44558442789.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210819045915.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/72494930522.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e6c1ed8b5---18923610371.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/0ou46nhej708jluehvj2ca1kk2/78914614225.pdfIn PDF document text
    • http://andana.us/files/files/doromarevusaxa.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/82635699328.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/20838607925.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/mawagutigego.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/gotomopigakejeza.pdfIn PDF document text
    • 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_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 10712 bytes
SHA-256: 2344bf398c2eb31e04380068219c9f346207a8e124d4965edfefe4154e106655
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 16556 bytes
SHA-256: a9f7a723a50ea8973f2041b9f3175b60174c5aed7cb812215eb8ebe5f0f5ca8a
font_02_sfnt_off00013cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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