Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a46553dca3a6af…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 15:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6eca34c071c2b21672caa0e876c3bf3b SHA-1: bba51408bd85068645640bb363c93e3a05c2a1e2 SHA-256: b3a46553dca3a6af804e27d2086c82ddfce9cc1242035ce1ff515f02704c6103
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites. These links are likely intended to facilitate phishing attacks or distribute further malware.

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 https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136847ca322b---gekawaneromaxuzorasi.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613966744a4c4---19946268627.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090209160673499.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/midabunorozekitof.pdfIn PDF document text
    • http://fivelscope.net/fckimages/nasudefuxugudakupimog.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/60991476417.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/9897970317.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/833541230.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137533560d8a---fekefinufitijemimon.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/59442437516.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192157425765.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/55138511737.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358bc21101c---pozipulopuwuf.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/59831573233.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/12627764902.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/tizusitirebalozo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/rupetat.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/85147259712.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/76201961218.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/wuvojawemajuduxolifevazig.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/35295bb8f7c700b847defb903c57f3ef/gogilunejizezinisifo.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/zometefelajobefinasefaw.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abab8fc50---48663395705.pdfIn PDF document text
    • http://mosjob.ru/images/file/55323465846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=custom+action+bar+androidPDF 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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 10624 bytes
SHA-256: 1ea25ab6ea09c162a492b3535ce7d4c6666a3ff59d1970987cbdf36e6e547d92
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 17932 bytes
SHA-256: c9054db52cf820137abdb1d55331abfbaea83168f27cdbd013feb4f64f12fc0a
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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