Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e1bd94dc65d1f2…

MALICIOUS

PDF

81.0 KB Created: 2021-08-08 08:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d695d99f9813229ac945567846604f91 SHA-1: d79e0af54f8011631ea557f433a7a65854636939 SHA-256: 23e1bd94dc65d1f23307d9c22a0e91df80e61a4582fc03db502a376fd82b251c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/22da2a95d379ec0fb4591d7d9645dd99/11082875193.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac89de67b---ropij.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4c61214f42fbbd7e5d0ac43b571798bf/xezoxuxobewerof.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6cab798b919f67c3e7c98d23a08c395f/bijubusuvelos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608719a753d30---dupewibadotapigogesuj.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5f892872---ligarajixaluxoserur.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/94611002669.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56685287267.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//dawaxifujere.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f704c6471dfd5bf2032128ebefd3f5c3/11071182046.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/kumasanadifolaladim.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c29f35120cc3d30ab45004cdfad4eae6/82546710892.pdfIn PDF document text
    • http://nanopena.cz/upload/file/rivetovikipili.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zasojadijoduxavolivura.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/96c2ad7d538d97e7ee48703439eb43d9/pekivil.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95db877fa1---fewufojokusoxipitu.pdfIn PDF document text
    • http://prestopc.it/upload/file/35914712704.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108422c50806---8489210984.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ec0lpcr1qee2akh52gut80v447/58918540493.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/gafewifatobofomabaniki.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/pewizexadovewesiwovo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210727_215019.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gidunazigajamoxenoteri.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/30112761437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=truck+simulator+pro+2+hack+mod+apk+downloadPDF 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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 11008 bytes
SHA-256: 8e63eec88e279cb9a32a157eb8b972c699e7dd87267324c6d27e4bd0f85f9b23
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 17312 bytes
SHA-256: b7aae46ce225866c6f616069d58d80d5e8d5364cccfd2a89a526469784c1e25b

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