Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a1e85c90bdc4e5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 13:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed124b603d63a3d8a2b2b3d9568563b9 SHA-1: e51ff754b7f7c045eea47ff464f67416f19488c3 SHA-256: 65a1e85c90bdc4e5bff4756c599eaa2ee93656877b2b9f1cc152c5ccccf85752
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely to facilitate the download of further malicious payloads. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=app+tv+offline+para+android PDF link annotation
    • http://robfredo.com/userfiles/file/94729569579.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cb5839eb36a8e5bd89026c371f7d5180/49979761810.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83047706253.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7203c25c---kemegoxotuven.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/bedujuka.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/48384536237.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/27815644494.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pojeserova.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/gabesiwokatokezezoj.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/gefuwivagazilevilixosi.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/pajowodedotijinek.pdfIn PDF document text
    • http://strongpointmarketing.net/userfiles/file/xofarawa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131015feba9a---wububabusu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/52423089424.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/vulojutusikimajit.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/tafabipubudekulap.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/zofixadegipanewipomezeti.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ee931eb9---16830959541.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/22857631508.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/87660519699.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/88685088287.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/84651248530.pdfIn PDF document text
    • https://norservis.com/files/files/pasabajeraba.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_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 17144 bytes
SHA-256: 050270e2ecfb6f4444d20c65e8ec73ef7854c42f29bd1cffb03bf45cec037604
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 10368 bytes
SHA-256: 562eacaf78b76f2b48001b73f12c05b26fd907a4c16e743d82bf445681db2ce9

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