Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b50b7261155b2b…

MALICIOUS

PDF

143.1 KB Created: 2021-09-05 08:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00f2926e22ac93927e7105cb4fd6fea1 SHA-1: b944ae436e1ef65b25e9b8817a6d9c508835ca86 SHA-256: d6b50b7261155b2bad76ccce6da182da6b548a6fcc7a5728bdf1dd075b2d77a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms its malicious nature, specifically flagging it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b4k866sms5ji8hj367amilbob6/29343504656.pdf In PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/79800e7ec5c24e54112849570353fbca/xifis.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16096a59e293ef---5785169627.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/79901746294.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/90560527879.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/13860404593.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0205d33c3---kemivotekuvexakitokota.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/533683616.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dugopimuxusamukeda.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210624171133.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/81428683510.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/jakazavadolune.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/bukuged.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/2810895770.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/77067279462.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebbf3c41e32aee9741d2b28b4375c016/visukofizurupewenezoraf.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2dc5028675b90cd35fdd279f6fed1509/gefosotivogezewa.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/13485648074.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/99665492257.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/72664158974.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/dalisijar.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/nevovosasidetowogoze.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210729234859064.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbec00db4e---27228110722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=calcul+puissance+turbine+hydraulique+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_off0001c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C254 22796 bytes
SHA-256: 24ab42c36b1654e3ef2a4b651170e709ddc12c62c1fc7d2567e17a07c2cb728f
font_01_sfnt_off0001fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21466 11128 bytes
SHA-256: 0eb38be294a7f0e6fe43ef554567c7fe734083407649b9059a30b4229539ea8c