Malicious PDF — malware analysis report

Static analysis result for SHA-256 da995e72dd2c4d3a…

MALICIOUS

PDF

113.1 KB Created: 2021-07-17 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 81743744831720a024057b5a66d67f71 SHA-1: 54bf4e7f727b5919aeb1ed11b3bcd51397cd6ec4 SHA-256: da995e72dd2c4d3a54adfe6505b7ecb2e945406101043f1aabfb071dd10e339c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • 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.
  • 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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e4f605aee38b0bd0e9328177cc20c7c7/xadeduzofewom.pdf In PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/1q24tiia08q88g9rrab8g3jaf9/debilekeja.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c9cae89d3---20827863076.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/473v3rqonjteoete6k3h6drnve/19514786662.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/27528007669.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/19718230251.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/17783357997.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/foxokolo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0f33cc6231d967e608a0145092e84fd3/50967246866.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c5f76fabdf4d06b41bdad91fe390e7b4/16690396420.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d2d8bfd5946ed13723f3669a066f20cd/56514185983.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc6fbb6bf1---30200796151.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/53925492691.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/fularitopobudasukupatem.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/65024888251.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/54510781802.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/75434969462.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/libaredejoxelave.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/kumizidukeban.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099b42c9853f---32736861159.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623511533.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/11bae13a4d347d39c90ab86f0acf1882/dupizipokamu.pdfIn PDF document text
    • http://wych123.com/upload/files/murewofazufo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89eae85c2---72068863915.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/1b37ef562100fcadd4fd78c749e3a78c/11378786585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=another+word+for+deridedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000187c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x187C9 24680 bytes
SHA-256: 80e02a63f422795f55a2b9ea871afefeaf8eeb97bd6ac8ed6a2970216585163a
font_00_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 29844 bytes
SHA-256: 240e407c6c07365a3fcfc6bf233c6ded26d4c222085fde62792498a31c99846c
font_01_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2F 4748 bytes
SHA-256: 8cbb55890ad8e9f48b635fc645297ffa5e9e3030d11272c31f1c67c15716a346
font_03_sfnt_off00017128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17128 10140 bytes
SHA-256: 7fb22e9c445c4a44ff13d50876c6e15c0285e6dab32dbf41bacfe1d1bfd78d5e

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