Malicious PDF — malware analysis report

Static analysis result for SHA-256 206902f7360b6d4b…

MALICIOUS

PDF

98.0 KB Created: 2021-07-04 23:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 057c724f64c842ee7638a20d9a2724dc SHA-1: f2a2bbc40a123324653a74e36be5fc1bc458b787 SHA-256: 206902f7360b6d4bb2df12306cf5f6c1461c5c3609ddb919c18fbd02ccbd57af
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1a9f053fa4a14fd26bba258d7ebd7104/xivogefatiwopuzizuf.pdf In PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/vugofezisi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a36f6b51a8869381ce11d572d13c9e2/29934446430.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab4467af7---73652826339.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1942b016b---30030070245.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wepexune.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/75ansdh4i0jmpju1fod5hs8o0t/47062287960.pdfIn PDF document text
    • https://iwistw.com/upload/files/seviw.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7688d50bb6d3afa86f2384fb228a6ca5/64302420594.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/vobataxenusetubeve.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/45131976167.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d68f5ed45---68729440449.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/49014282652.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/21358077045.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/oq4ssgug7t6ht08fbqdh8ajipn/25063529544.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062812011965.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/julagufejowabebikuwojeze.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210528144411.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m3hl8d8b8l809q05o05b5h0f4e/23924575321.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8bf0876480ce3427b30ecabf5c4abe08/86151768055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hard+chemical+equations+to+balance+with+answersPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6b7272ab---91995846332.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 17384 bytes
SHA-256: 8a306841ec96bd5f378cf2a0bc0dbdbde6a9c4de0e2958d96dc0afa1d50d323d
font_02_sfnt_off00014b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1A 11100 bytes
SHA-256: ebc55c8653dd25018f5b289146e596fd7be0247c720d82d688223a9d8c2cdad6
font_03_sfnt_off00016491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16491 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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