Malicious PDF — malware analysis report

Static analysis result for SHA-256 656b24ad2b2a26b6…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8e94e0735580a53d43620b25908b2c2e SHA-1: 1a4371d9c0feb5c75cf079caea1c3ab94d8448ee SHA-256: 656b24ad2b2a26b682a6345942c732e3b556db99df87d75f53caf5e4f8fb254a
156 Risk Score

Malware Insights

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

The 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 sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/puroifsh5f7889kpianagpcrdi/mapagarixosisuxukaju.pdf In PDF document text
    • http://www.toeterloeh44.de/files/pafegevofosuwoz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/alp6ieo9rpcbv5i4dsnhpn24o7/96637167892.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c0ef78e12ab33ac195d7e2eeb5f0d9dc/19240710003.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/zimafoguxokunifatazanozi.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/37420860951.pdfIn PDF document text
    • http://ahchala.com/img/file/94794294604.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/72644669577.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608151cce645c---84860932237.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/blmi2oaht9ol2i596uoq46a4uk/74957047763.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b4858803---fevepukutupujobiv.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e84931047---78900845677.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfdd827fc---53866802014.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6eb8fcf3---luwupinalaninekoreg.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071539136ca2---24915466325.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/23905ng8d009s0tvk4u8a4lfsq/wotokalifidagokifa.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/84010520529.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0k658v4fu9j8pgpbvphbj64s43/56182389429.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/zubirinofapunolutevuzi.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210619050813.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/34559547983.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c001984dcfb---pibigofopabukiretofaz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a25484208684a5771b6daaef8537e3de/muvepusunotugig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=coordination+and+subordination+exercises+with+answersPDF 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_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 17624 bytes
SHA-256: 9e0546c49f0499cea658d7ca4d917d60688b005185cf854b1211dbcf4c8157a8
font_01_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 10880 bytes
SHA-256: 02200c3106e8e9dd6d548059c8cff395cdb668172f94f6572cccf891f577818c

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