Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f21b1650aaeeef…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 18:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22d47c6b3d661530d47567028ed9e232 SHA-1: 8c7cfba27bad4189bc7f9785e4043be807cb6e60 SHA-256: d7f21b1650aaeeef633529bfff3a5410fb0b3062492a52616cce8be659b06608
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608220fc6d95a---xolototebojevadel.pdf In PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/bcr0pjetkc7p568ifmnsdciasi/7519065944.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/bezitukemowazuguloxafakos.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b3d35402f60da9c315f58303fce03268/32474852665.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/345a6efa7935301a29461faed06bc6ef/66033571802.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ebde9d8e---84290706827.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/nizomavunuli.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/sasomokatanoveda.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/relol.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dca265a4---guzejejagosafotogotigav.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/914d366784521ece2aed4648d82eb1bd/16073589534.pdfIn PDF document text
    • http://hzqzg.com/d/files/nanejopumajufes.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/78907624850.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67675569fd---86823568518.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/supigo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ec909c33d3f7c23fae6295cc1b0e4ce1/10809248563.pdfIn PDF document text
    • https://tmtteks.com/files/96668995019.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e33d880566b---juzipevopirus.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82c980a44---66475010508.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rel98fd995fqdi337u4ojrr3h1/1236739617.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6d39a175---22419518846.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/lokujugalowegu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/kowedufoxitoto.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/772211acd2a03d99cc1bc7b6ecb14997/givogov.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/61596004307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pda+technical+report+13+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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 17824 bytes
SHA-256: 1bf6d1ba8854e85d63c7eac0fc66e894f9e6f9bd6c113a07c1b0b6c5de6a7a78
font_02_sfnt_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 10776 bytes
SHA-256: 5fff62a5954f484abd4d0cf9f8a9c5122cb75ea0ad43fc785f8690fe8284568a