Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1095fb38d547542…

MALICIOUS

PDF

92.7 KB Created: 2021-09-09 21:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1df7bdd1c4a8c60e6d327136ddf2a584 SHA-1: a58a2ac3b32f544903ff18cd6e86900d657a0579 SHA-256: b1095fb38d547542397766b7be65f123c2c841da72df526c5b30dc1b25eeb04b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a malicious intent to redirect users to potentially harmful websites. ClamAV detection and ML classification strongly support its malicious nature, classifying it as a phishing trojan. The document's structure suggests it's designed to lure users into clicking links hosted on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://catamma.ru/uplcv?utm_term=free+download+mp3+converter PDF link annotation
    • https://zenithservicos.com/userfiles/files/57774680896.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ef0af95edc1320c39b91a4bc8c739ef5/kolodasodigalaj.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/76797076234.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vonepudififamowabopul.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/67822666313.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7b8ca291---zafeti.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/21645205882.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/samiridovufopatujizomu.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/25104684654.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/gaxusidemoretute.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/jegogej.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/25364681155.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nvtnj0tpfd7jqibo8qkvb651up/rajerasamotilipuwuk.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/pixib.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h9umnempaktei8oj1oun0tm7de/73147586990.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c15240edeff974b2b2dc0686ec262782/34966515057.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/25467252752.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nagurusakukolomopulof.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/25723057671.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kumejowibapajozadobexaw.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/73412364030.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad421afe1---49300751995.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70729035600.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161355e8745403---poxev.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/tulerajiviluzuxada.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e9db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9DB 17936 bytes
SHA-256: 4d4c5810c1411f4bbe41b3a0543cd2d5935c1c5b801e9021b6dc89b0d3f8d173
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 17856 bytes
SHA-256: d4931896cbe861a4718feed3a69d64404fe3f1c24ac1731906a8fb46d76cd30d
font_02_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE0 10716 bytes
SHA-256: 7b009e835cb93fd512688576106963521ec18f7f15b6e40b799137fe0ff909d0

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