Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8f09d573958548…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 21:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64ea532c6a79867f03c53ad2c6e2341a SHA-1: 2f79654f58a4fbdf2e010507671268ea3f0a5645 SHA-256: 2a8f09d573958548f421cd8cfb76dfcbdc50bc5c8fee3684a0e5e60ea8944291
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://adsbudget.net/userfiles/file/87684432321.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0alu7gvv593p6jphfl715ru2m1/97614737376.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nosewigozali.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d99b39f4---nupejepawakobir.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/73346606469.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lagavu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/zuzasozanogovini.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/vodesexegopotawuvusut.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/zufenopematafoka.pdfIn PDF document text
    • https://blogsma.com/files/xenutibenuzitalevoduw.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/23769116397.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18410572343.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/vosisukodeva.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/lanuzaw.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a13ad5dfe4e2c7bb91271e5a26aeaee/vewegoxofagatolato.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/96554367837.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/14954631939.pdfIn PDF document text
    • http://ossokahve.com/upload/file/ruvumemibifa.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/09ffa2683c12a5c64f025e3faf19954b/43241918163.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/70837497998.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/32873835179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=xvideostudio+video+editor+appsPDF 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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 17872 bytes
SHA-256: cc300e5c51df2643cc255cc9a201bf231205c189d9f2c64ec1484d7f96e3ed74
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10408 bytes
SHA-256: c5a195539e042d17723703b048ac0b67e700fbf3aa60843a4786691078c1e7c1