Malicious PDF — malware analysis report

Static analysis result for SHA-256 57685acc5996d8d6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 19:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7fca7669edbaf1bc7d868ae231cde1bf SHA-1: 580f3ac3f558be0ea23357a5eddce0c31559479e SHA-256: 57685acc5996d8d657ca503549c99c5ef7f58dfeab18aa142eaf62c34f9aeaf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161010aedb781e---felojepu.pdf In PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e606aa2c---34180724724.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/fepikuxoguzigulik.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/sopow.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b00f5393fff339a7077edb6080e781c8/butekinati.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/36620352319.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/rumexux.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/17280859942.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16072938f6eb4d---29447993176.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1556bd19---10416570786.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/88424704649.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160857872043bf---gisab.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/27108282765.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7e440d17be7d9473ce69e7ef6cebcfe/sowomodapinurewodu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a908ed00098---dasukepigotipulog.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/kavudukaresi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a875r0leon4ghngrbt95j7ac1n/8387782104.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zeminarumotimuzanexe.pdfIn PDF document text
    • https://2acontractor.it/images/file/53947211753.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/79982893602.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/dojij.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/kamuvumevogojibinoj.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/98089961453.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/2185282150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gscan2pdf+windows+7PDF 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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16976 bytes
SHA-256: 75b10ae38ae03543185a6af1ee2e1a653dbbdfd6b9bab1cc5c9e7d1490dca1b2
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 10532 bytes
SHA-256: 7169112b3c673942155fd4fd68cb8311fbf9e60e66fc3c3dc2f80acc852af155

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