Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f7ecdc9dd582a4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 09:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a16cba1d2660210c102c5707fcd27142 SHA-1: 58b13502326e800b375246224480f15bf248c84c SHA-256: 95f7ecdc9dd582a4987049eac02d8d595876e859ecb24ced3e11ad9718e34688
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. This suggests an attempt to distribute phishing content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d256125e8bc3dc8e6e467c853a124872/80691029337.pdf
    • https://triatlonshop.cz/userfiles/file/lejosusop.pdf
    • http://1544-7419.net/upload/fckeditor/file/94496615363.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/lq3edii4juv3d3jbqq0tc3jggg/45786621161.pdf
    • http://kidsjeodo.com/images/files/25041392586.pdf
    • http://kunbot.com/upload/files/mivaku.pdf
    • https://catbasailing.com/upload/fck/file/tokafebuditabibabaz.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bonarifazafabibiw.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/54157831970.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/75709925613.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3558f0f1bb95a5432b06c8397b4e8cf8/bakuwekipalo.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/juraju.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3da56e73c2c8a9261f06ef44c773b995/magivasoramikesoner.pdf
    • https://299-45.com/CKEdit/upload/files/zesomotilizovimagu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e7dd497---55450208002.pdf
    • https://audreyheselmans.com/_files/file/dozado.pdf
    • http://fosterfreezesantarosa.com/uploads/files/vetumupuribamaget.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k2nnj54s6s5559e37o155r7f1v/winorarelopuv.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcff63a06c---poxafilojikuropala.pdf
    • http://emekyesiltepe.net/images_upload/files/98694350535.pdf
    • https://menlopark.com/wysiwygfiles/file/nogimosesijifedisov.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/a8a8abcf8eb1a8bf9ed7672ccde60fa3/xinukukizulokar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=preguntas+y+respuestas+del+libro+de+esdras+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 16792 bytes
font_01_sfnt_off0000e09e.bin
bc9bfabdeeac9fd1e9002057b582518a3b50edb0efb4368be31577a55818f2de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 11028 bytes
font_02_sfnt_off0000f9f5.bin
99b1ea1b9896fea95665c8a120553d33ec4d0f41c44940e0733a18411e0656fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 19396 bytes