Malicious PDF — malware analysis report

Static analysis result for SHA-256 5294658136043866…

MALICIOUS

PDF

85.9 KB Created: 2021-08-10 07:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee4aba7a5090d06e0b5e61d811379f29 SHA-1: 0358315048dabf1f1a855607f13b4ad3aa933981 SHA-256: 52946581360438669ef143b85eecf0c836b80871eca7ef678dcd14c1bcd94f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution lure. The file's structure and embedded links suggest it's intended to exploit user trust by presenting a seemingly legitimate document that leads to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=slope+intercept+form+into+point+slope+form PDF link annotation
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/bd9f0a266a37d1f2fb3b18d5f5cc5fc7/16358723921.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e0443de0---zisetutozig.pdfIn PDF document text
    • https://morabia.fi/images/file/6066095944.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/144d04018adc0c238c16b7afeb5d3d18/96480305236.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/gexudalexanikotowekajized.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/04f86710ae6280db7a05d28acce53319/nokunumi.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/woruzoloremafovabuwutezit.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105180044.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608423b867eed---30650472684.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c026abe0---tajixetoneropipukeb.pdfIn PDF document text
    • https://europartner2.pl/uploads/jipoji.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2b00ecd6b1042897ef9690609858a6ca/fikituzopodimojoba.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ee9a5834---bofasax.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/jelifudokamemipewe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e30f21f5f---bevosimoxi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d3dc5a4ae6025abfb44913985b65ca78/82271049204.pdfIn PDF document text
    • http://www.asslar.de/downloads/56724963996.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/dq7mh7ijtem104tomk22356cag/tepugew.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5849bc5lr0b1q0cetregtddh74/29820934251.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/79314366560.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cfrsput8fddcebaku9aevcsu5u/fimuninudosulekupepijedo.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/jejukukab.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/27526829794.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/doxonuk.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10552 bytes
SHA-256: 32463ff741803bbc06d861316b600847f4b9d2788facf0cb4966e43e2118dbaf
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 17520 bytes
SHA-256: f1d2b81ec1b6f44ddc75cfc28378f4d255d4c19d43d0f2eea9b80aa9a9f5d73d

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