Malicious PDF — malware analysis report

Static analysis result for SHA-256 143a6d2f5ffc9c0c…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 04:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fa1700550909d4e00e59640227dadf40 SHA-1: 1763b2b972d93b6eb3df7bdf2abae8618160234a SHA-256: 143a6d2f5ffc9c0cd1c285600c6d8212b18f6af081453cc3051987823bd641ce
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba5a7475a---65973162550.pdf In PDF document text
    • http://nct-vn.com/userfiles/file/finoxasudadobegarapote.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/aqva4i3umr4ntqpsr6q2vpumoo/tesatolewenami.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a0122e3e---ropixuxedorelot.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913681850bb---putajexubavopazofopa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/kgeqotkeiq3ho2l8b6hsoc8v21/feluraxofur.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8fa396370a753246fb079aefac106f98/30562039462.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210506041914.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32e91c0bc83c7c0acb5d065f36d2b114/taduginojigifewuzetupad.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/tifokufagopipazupunaje.pdfIn PDF document text
    • http://imbirimbir.ru/files/43760218924.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74844420680.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/ea2912f319ce214eda153698cce1c058/84886052715.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e92803e63c5c3f5d20d82452bea971c5/bividefuwuraxutuvup.pdfIn PDF document text
    • http://siembra.me/uploads/files/46378507438.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a647ddd80b2c96f1fd196eb35db28c2/namiwasodevoz.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/dejimi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/49156158452.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/866fb907280d3d17d2be8b635cf46509/favob.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/23486271281.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3841c42a3---dupatub.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d266154dfe7d68298b9f4015fa578062/3213957978.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/48916687751.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6ab7ac61a---monowiwikadikapikomosel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=changing+active+and+passive+voicePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 10744 bytes
SHA-256: 1df28a0e25415e4d3fc01e5028cfa8989f5c095c9259cc5de7950471e8368577
font_01_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 17048 bytes
SHA-256: efb5b2cb511582831628cd99e5f89cfc9965592c62a3d945a45c977e455761af
font_02_sfnt_off00013247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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