Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3a0c56d0025810…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 17:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8abeba833d0b1475517670878ba57a16 SHA-1: 10c960ad1017bb38db0568d7261bbd448ef52f77 SHA-256: df3a0c56d0025810ec833ac3fb4ac5f6f41188dbda6b8c0c2374a7cbea4253c5
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc2ae1d92---mujelimudanudoxif.pdf In PDF document text
    • http://intertravel.hu/_user/file/61418469608.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/raxebiwolasulezavedego.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/witibopagegizifewokovetu.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/tafelexadaxutugubojozor.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/108904dc1dc2181e2b10cebcb4007b2b/birifirusuzogexipagexifoj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5becddd7ab853aed101d20a682245702/94776634718.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/47909745140.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/gafumubirumopevaxariwu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pfdhsk429j3vukc3rfqr1l160u/vosalirifipoda.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/22044380614.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/18654803364.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e550f54ac41a32d63749392244d9510c/15391489414.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9573873711e6925d3d05cb3576c22604/xidosegimo.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/vikisagujosapapeler.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9199835573---26423959860.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wejiruv.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/82229817793.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d25bfdb56cba90f72a3fae69bbf3abcb/85703992776.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6289a339b84aa336195123b318741d88/bevuwovuvilenogarogatoxu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/zumuj.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/82490385256.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/sixuzatupinegotixuzemu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4c59bf634e8c146ab4eb655adcb092a7/kodapa.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ql7h1dvevu1ign521i8mp6dn52/26954992095.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/91661982375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+and+objectives+of+research+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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 17344 bytes
SHA-256: c4461ddcbfb549799980a97bff45fff981e411162385a6007813fcd2804c9b0a
font_02_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 11184 bytes
SHA-256: 4a9cc75ce6bd53d82ab0e9c80a45e9db3bc7ea7a7acc3f49305e66eafb641913