Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e88e23881406bf…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 13:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf809753368b915b4a6a78420d89537e SHA-1: b15d122f96d1196508e6e0ba3d77626139baae34 SHA-256: 22e88e23881406bf38c4f21e58f3982f38879951c4232d41666728b031e73244
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://capital-tic.com/upload/ckfinder_temp/files/20210527072553.pdf In PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/ligudobejefepixime.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4f9efd5a92574a6ed1c81a672f3ce2c9/40778389289.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/86197711972.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6e36ce5ca9e47e2cd26d6766d5886a29/90394363317.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2889q4g766uvjmud9ce7dqfu65/kavedatexedeso.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210714/file/16262454881852.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0pju033stciujbvt0jn4lmchi3/bedagezolowuwekilojifij.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/58702877249.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/bemoxexeb.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0c69b1ef74290622a097adf2e7bfc12/bekixiwufasasamanifelopas.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/6225028889.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/9479566798.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/zotodet.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/koxesarerukarijudif.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7275fac459a442be175f069d38d56173/76273437519.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/39842273267.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/91879270175.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0bce5f59---85590655836.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f31929b5635---59142286265.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ac284c28---buwavekega.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/wikarimana.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/82854947640.pdfIn PDF document text
    • http://uco-kampen.com/media/files/noxijemojovesofaputowaf.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fewavitafiduj.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3aebfc249a611c58130dd5363b6f246b/pemikepefekekiwezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=comercio+electronico+y+negocio+electronico+pdfPDF 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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 10776 bytes
SHA-256: 555b58a67e1d5b4ee0c5a8b4323d9ffa9e22758237d56ae05848d9466f642ead
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 19152 bytes
SHA-256: 05c9ea27e65a5930c53da502476602d1cb43cb62e3843b5d1d70d1fdbc2f9caf
font_02_sfnt_off000138e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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