Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3bdc2f18d736a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 23:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3344872a0a7c5f81a447daef318afc3 SHA-1: 9e5afd580d0ce0f5d52c8a8c3902620ac8df1a6c SHA-256: 1fe3bdc2f18d736a2dc12f6cd54ad6d84f3f20f098b651a4fc55870035df29bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to obscure malicious links within a large collection. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobilaide.com/upload/editor/file/fasofipewix.pdf In PDF document text
    • http://imreelectric.sk/uploads/file/figanaguwuzowizoxazakuv.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/49183855956.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792b3c34c8f---74771676345.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107300255087729.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zigidefir.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/74360601802.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2f5f9cbb3c2326d3904eeb1528cdcc5c/12736120255.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j67tl8vugoi7kt46bpoaspl7s3/liwub.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c48a20084---13941808112.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/e7j73ea12urpvbnc2kv57fpm3h/80228026944.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d331179e---74069721134.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d5b051817ad0f2951d373178811e6629/81772008488.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097122f1582a---15301679885.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/65357470120.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/7556464906.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1e59d333b---duduvidajed.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/bukajesopize.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6oi3vghugse9kde3p5i5oukno2/rowedud.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161195e9929ff8---mevulagonoxi.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/43338005459.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/povasivexipuvivexu.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210726113820_dGVtaXJhc2V2aWJl.pdfIn PDF document text
    • http://freeski.hu/freeski/file/jiledawiledoxobomes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=general+anesthesia+intravenousPDF 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_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10408 bytes
SHA-256: dcdabe809d15e492454982db676bc52d0ebff4c155bf7c88d092b6d50f277936
font_02_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16388 bytes
SHA-256: e3e16cb05d86038e6dfdcf77ea99b5b190eaaaeea32de4a2af5bcf063586cb4b

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