Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9487b3f42209d5f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20f65a6d5cbf017fff77a731eb4fcb23 SHA-1: 7c0e53ac60dccd5e2ba44958b7404ec4a0eca7ad SHA-256: d9487b3f42209d5f073f28a21cf89ea666ec923795ad38e5cfcddf5bfb7c0f2a
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 external links, including one pointing to a compromised WordPress upload, and a URL with a 'how do I lock apps on my phone' query, suggesting a phishing or social engineering lure. The PDF structure and embedded links are consistent with a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=how+do+i+lock+apps+on+my+phone PDF link annotation
    • https://mayphotocopydogia.com/upload/files/rekimokuvujibete.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/42459276010.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/85604567824.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/24540818563.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/vutokoz.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/govolubomakobisoni.pdfIn PDF document text
    • https://edarky.net/data/file/35765234511.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_12B7E1E26689644D.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/29967310792.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/44480887222.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/waxinosejixegipusiviz.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/nofen.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/ruvonifavabexopanazexufa.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/99008703621.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/dofedadukowogudatunof.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6c44ebd10dd3c434ad4bf69cdc95342e/poganalijoxilowo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143be3363475---5588144121.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/56680112013.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55b90e136---5567954667.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/foperuvixaliwoke.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/dudojo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/95512401979.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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 17488 bytes
SHA-256: 3fad47c0e3834d4249779245012b2d2be59dde361dad6571f35d32ad05a15644
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 10864 bytes
SHA-256: f29816a50ba73887a9a525c097d833794dd1654c49c9c0bb8b3f1f7a67b07ab2