Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb3a677adbc59e3…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 12:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ebd9e4786f1f0c2255a5bc42466a18c4 SHA-1: 89250322aeb4fd35ce05c5c821ec09696039a796 SHA-256: bbb3a677adbc59e332dd57b17c00c9035fdd327dfb5c978be4a4a36607517d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/95aaf2373bd8ce63d93bfa2047c445b1/fetetufazazuzepabebatiga.pdf In PDF document text
    • http://vrieshorst.nl/images/uploads/file/71951792083.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7ssk2p8ld58lppdh93gaqvodh/23015815961.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9vvtid9vkeka2n7lvquuhumn02/44137661944.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b82811833f4---xobagasudidajifol.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9it0546hbaur8d6s26l0ts6n69/66745280188.pdfIn PDF document text
    • https://proxus.nl/file/zodugoromikolizenataruwi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160debf071ead3---34956897513.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/12888409539.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/29098946447.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/nunenilokitakatupo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a51a9d66f1fa6c2b8ff529b227064473/71344290117.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f79093a3---22669082143.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lopopobudupipebirigewa.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zetidul.pdfIn PDF document text
    • http://ahchala.com/img/file/fipusarowaruj.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/se5rs20stpnf3arf8indolft1h/43342888800.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/f2478a41df229d32509c17d8cf0f93d5.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/88db8b6b921251914a59d87bb56c3e60/pitof.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf787c9b3cd---88762547383.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/66368321282.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kobifutugolapekefifig.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/43331744576.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b8cb331c02221457b6ff06105d67635a/forujigixovol.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606feed3a08cb---65642094630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=water+cycle+blankPDF 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_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 16708 bytes
SHA-256: 81e734ea5e46b07e20d2a62b73634aa04ec6ba077bc298ae40674c13e3d8aa84
font_01_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 10180 bytes
SHA-256: e9f712a27d8136f1da118f85666bfeb9788af33033d1fc4db997122018027531
font_02_sfnt_off00013754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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