Malicious PDF — malware analysis report

Static analysis result for SHA-256 3434c9ec9f7f7993…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 18:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 847977b14f7af5865cb27f77a7b79c66 SHA-1: 0c4c7872fea527431f167db193c801121ad7447a SHA-256: 3434c9ec9f7f79938fbc556093ea50a52ba50d58580e80f1c0403a1dc1b50e1c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it's a social engineering attack (ClickFix) that instructs users to disable security software and execute commands, likely to download and run a secondary payload. The document body is heavily obfuscated and unreadable, but the heuristics point to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca143a385f---dedelaxunefuf.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/27916208364.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b24c73991---pijogubufofapirolonofa.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/givazumadizokazafu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/44584880264.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/nogokevemezivivivotudisev.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609456cbcf569---45955535783.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/popida.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16277797390196fbfacc814f235.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/63789544712.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf32d75a8---3202511150.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ed4c556ebaab2918395295a6b28c9bc9/282720614.pdfIn PDF document text
    • http://ahchala.com/img/file/92037820232.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/vonire.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/xotasivizabamegagag.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/60533909490.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ed833e8c---voxazimenujebizejonuzax.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc0abbc64---99282842514.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797dbfeb287---mukukemopufenop.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610626465ead2---zofelavasegilidiwezobuwe.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/gadebabadovasobejiluse.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcab90f607---bigadipozisololomipitawe.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/60873862801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=logitech+k800+keyboard+not+connectingPDF 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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16384 bytes
SHA-256: f93db4b02fbb06226000ce7da3edef255457fd9ce3985dd682b6aeced8fd2ff5
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 11068 bytes
SHA-256: 59a39083042fd203a3a7c83df4b52055b810714f26f4819d4e90582d0ad9e8db

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