Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2350278c9e139fd…

MALICIOUS

PDF

90.0 KB Created: 2021-08-21 15:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff4a499da59a591afe587ae264fc9e73 SHA-1: 53da119e1d04c8f8b0c2b82915ccd47d8c818311 SHA-256: b2350278c9e139fdca6220809f1d6af9f4e85a111aa7d7fafdf4675032ff573a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dutchfansitenetwork.nl/ckfinder/userfiles/files/xotovekoguvunovanenutore.pdf In PDF document text
    • https://eternalbliss.net/file/78665148805.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3f044840c06f9ef86c06370aa6ebffc3/15805555408.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/71d9c579775fb0123d77980915a66de9/75482510682.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/fupato.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607157785e13b---xamatewijupovafipakizej.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/56883363863.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8f5b661---zurorabav.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/70619178952.pdfIn PDF document text
    • http://dothi.info/images/files/ralub.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/64144450659.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/94493808823.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/mugomobiwanuvatipuxib.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/sewagudanowimodidunoxa.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/wigutulefisufirofiguwali.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/lufane.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37a8b306ad---fexojep.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/poloxuzix.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/kewinujidod.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a38c9c1f0931eb38111c447ea4ef1075/mudoxuvibuturekomirifige.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/nolividutegi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/82623791998.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-7/20210607132226859375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+print+2+pages+in+one+sheet+pdf+macPDF 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_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 17232 bytes
SHA-256: 8ff1b99e2425f20903299409152d65c968fbab55ff74e63ead56b9a239fbe568
font_01_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5A 11220 bytes
SHA-256: 7b8706e6e2aafaf7f13fa984ff1e1f682ded3c41cb668268631854e1c7229291

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