Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7947f565507b668…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 23:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f3b9dc3b5a991c99214d0d2454dd1f7 SHA-1: 80611ecb4149cbae1116369d9001d94aa138af9b SHA-256: e7947f565507b668fbc2d231abcc9b90660e4f5161cc2663562a0478113f6de6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://wastran.ru/uplcv?utm_term=big+data+analytics+notes+for+cse
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346048b052---82103224009.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1380db70cb---rivebefavowupunigopumak.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6d1es9tth4ud8ostbn1dtqu13o/rozaxubuv.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/sosimegowukupodupa.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c6a5d197c---sagitiluxotogesexofimol.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d079877f4845789a3cb1693f823ac3ea/fetarosokunudonerigef.pdf
    • http://aqbnb.com/uploadfile/file/bewir.pdf
    • http://www.contectrade.hu/fckfiles/file/93550661972.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lb0n6btad735q576l1d406plcs/46502318595.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eb554b48157756283b42ec3857c724dc/11810330417.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fef31cdf---zanaxobavoxijaliseki.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210610_25F231EF70C4CD62.pdf
    • http://amexeuro.com/an3_Uploads/file/fularega.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1aac9f4704530e9e7d5625df6b2723a6/7701999026.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/975cb00af2d36cde6ec966a09d5889c7/1981153181.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vsphcmdim0su1k3smg7rmp2tgs/69008893610.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/717e280ac50db16a9a9b2ce910f48a78/wikufegakowenukakulusetud.pdf
    • http://meyanko.com/userfiles/file///25641816086.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7635860e980b4da218dbe362d6db626f/bagenezosemum.pdf
    • http://coeb.eu/userfiles/files/86315319048.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/803ad4901e823f5add0ebe2b56d31ca9/fugivulatasowomujozipodi.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b522528cab2---wutukofib.pdf
    • http://prime-standard.com/piceditor/file/56298032838.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8c44eae81fcb92aa72f818a81bff293f/wakasino.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9187c9fa---vovujimer.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cab0b7613571c6685deaaaad3a3c074b/48749593706.pdf
    • https://ludifrance.fr/userfiles/file/99218257612.pdf
    • https://40parables.co
    • 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_off00010466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 16792 bytes
font_01_sfnt_off00011c78.bin
607c76b7116f8b856f1c586cd0dad8577a8ec59358bef8736c8a605e0114db30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17028 bytes
font_02_sfnt_off0001490d.bin
28ef3625a5c35effda50021998069e1bdbb4072fd465eec2d599e5b7b6c55037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1490D 10816 bytes

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