Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d486b9413a1aaed…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 07:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40892e4037bdd6b2036f224697e5a77a SHA-1: 086a61b8387597db9d02a42e01cb7a15926e2a87 SHA-256: 0d486b9413a1aaed2caa26dab68329324dde5cc51cc2a20611094565c2a93cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=polymer+blends+a+comprehensive+review+pdf PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3d6icfce7mag15c7a7hk7c4csd/ruxijudiwedomixowete.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/lojapu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/41989709845.pdfIn PDF document text
    • https://everestart.com/images/stories/file/55097353344.pdfIn PDF document text
    • https://hoalavender.net/upload/files/tovezikevenafimabama.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/83847746906.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dbe42cb48---nipozidon.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/vibopimevilatu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8717ia7k3q85n1pn60d6p7biuc/wovakawaribog.pdfIn PDF document text
    • http://chapelguild.com/images/usr/kiwepinuluvozakizometofip.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tewudotaribofokidok.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814a7617cab---79823727377.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/97a8d72e6677935b489b3d87bba32bcb/zekak.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/8093660453.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8570e1b9d---fupopusube.pdfIn PDF document text
    • http://cobmedia.hu/include/lekuwodib.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/84354344330.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/52892174383.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/tikunun.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bmt7pk57stcf2835dn8p2t58ac/junevufawejazoraxivubazor.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/41540537381.pdfIn PDF document text
    • https://drsaman.com/files/pesomiwekebanid.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b291a3c70fb---xuxutozuxaponuwedozajoda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8933dfcd2---migigokuxirijam.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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 18524 bytes
SHA-256: 2338aed009b59179e375eda14c5c85410901852fdd3a5ae867d30db3dee485a5
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 11192 bytes
SHA-256: 2d46536cc3d1c84e2ffc98c093f368a3fd3ee1f8e202fbf9a5e7deb4d9c972bc
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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