Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca178330992f1532…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 19:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a572bf68e0711e641bab1717f16f5b0a SHA-1: 2e20b45c74d1318cd3f9ab8ceaa4ffb46b3a5184 SHA-256: ca178330992f15325fcdae1b61f995f1ebc317821ee88f9b42fd81eceec84d94
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised or disposable hosting, forming a link farm designed to trick users into downloading further content. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://needlugs.com/userfiles/files/wezigarimutesata.pdf In PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/98634244091.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355dcb899be---37372823802.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/97822017146.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/vexuji.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/15892537402.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/87031595546.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/80001225833.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2k4rimfomfm7llk0bl426v3j0q/lifixitixigujopixitu.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/44186689690.pdfIn PDF document text
    • https://ocw.tw/uploads/files/35774614418.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161388ef6bdd6c---nugiwekuwar.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bigiwizosufipatug.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210910_110436.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/wogiwikiroladorukisof.pdfIn PDF document text
    • http://rurisnet.org/images/file/46754745307.pdfIn PDF document text
    • http://boki.hu/editor_up/46195009446.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_5B167AED160DE825.pdfIn PDF document text
    • https://anaksemut.com/contents/files/benorusomof.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/26473336053.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/489e518e38e525f118af5f8ac580672c/1435087672.pdfIn PDF document text
    • http://splogservice.ru/content/files/gasolerosugor.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9d608bbf---nuxunebogiwogabanofofav.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/pexilozunupigo.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pipodirepu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/972d5779ad7f5c00f531f18b5b5208c1/nisozabadakaselisolo.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gajesebigamujunukesiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rise+of+atlantis+for+androidPDF 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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 10392 bytes
SHA-256: 46bc773992b69a3c866d7b77da26d92ba633468ed907d276b579623f3d78b7a4
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 17048 bytes
SHA-256: fe0efa898758b8cb7d23a07c41a84269c564fcd0b0a64831c08b42b8031aaf0d