Malicious PDF — malware analysis report

Static analysis result for SHA-256 df638af64341c346…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 20:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e23d3e5262d7cfc614f1ecf6c58f767 SHA-1: f810a03a09314351385495e8cc8f64abb0d574b2 SHA-256: df638af64341c3466b15c2205e14f1e7bba64936e397670d99ffcfaf52d6c36a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This indicates a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

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://isabellepieman.com/userfiles/file/pepoxalotated.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mgci0ekd60b302s1evq13i0541/58932708130.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/31s9l26lpg9f9jqhsralhevum2/lovugufamujitijakipowipi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/adfd6286aaa8c7dafd5c81f74f3ea197/63964361436.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b866a6e219f---gopululojopulemo.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/povusutetefeni.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/xawoviw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161266589230f2---salorufo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d83590a9d---92386494654.pdfIn PDF document text
    • http://aimic.com/userfiles/file/88630724162.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/q5ld3is32an2o9tcsltc1ekcbp/12442482220.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/rurevexaboxagenuruxi.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/64126390778.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/1638966636.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/dupitaguvapetorutas.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b45164626bdfff6e870298f39352797d/44967299747.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/nazobijeripenemofomi.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/70935776078.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/42862776264.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/wejum.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/sutaravolo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c01e75e7f32ef452d0778f082e7d2ce2/mejamawizuwuliziwiw.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/88239520761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=slang+words+and+meanings+pdfPDF 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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10904 bytes
SHA-256: a9be04886776bd8c6fef5108f62b996b0ac1b3b5b7a13b42c73daa23fed910bf
font_02_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 17988 bytes
SHA-256: a3977423a220c5b0f5a6e579517ecbf08099b8ba57d7b1b8bbd51a9d9597045a