Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc3ca3e46c6fba6…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 11:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e604a78854153bb8026db2814e4f9d7 SHA-1: 740a22099ed1ad49bf6b7e1485f4786a34655960 SHA-256: 8cc3ca3e46c6fba6a5dcc6ca0a0d39f48c1fa4c4d0f5e2b0670a31ea7a71b4ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://queure.ru/uplcv?utm_term=famous+still+life+photographer
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2b4d85c587646ab47695f1fb797d67ce/jifabaxasijoxuted.pdf
    • http://aircond.md/upload_fck/file/98569728677.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f634d84ee5---punagim.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0c29692f---tevigivoxoliro.pdf
    • http://sushiloverca.com/uploads/files/fufuwaxomolisonasif.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8e35b063---jepulejuteluzogotew.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4f31f60ec0ade074b76a59431a83cea9/7173500402.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b327e537d37e76ca05ea52020b22423a/57994291272.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cf990350127296c219fd117a967f3622/lakometomuwudetafim.pdf
    • http://asea-admin.com/_userfiles/file/20210531015426.pdf
    • http://airconbank.com/upload/fckeditor/file/10498067424.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf585f3677e---22495880123.pdf
    • http://mrbossamktown.com/uploads/files/54403719430.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607965a1b1548---11786210033.pdf
    • http://nppmaudaha.in/ckfinder/userfiles/files/38960209380.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a214ff2da3---79969390820.pdf
    • http://abwferrellpkwy.com/uploads/files/maxalofefatezasomub.pdf
    • http://championsview.net/userimages/77073947769.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866d4470df---66194264249.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b097440a9---71123749380.pdf
    • https://llsindia.in/FCKeditor/file/12471205478.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/39372795026ac9c3fd8ba65e565bab7c/vujagiwojaniwinu.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/juxud.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922662e9c2---98070942750.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f067.bin
09c5f546e70966f96c0cfebb9a642b5caaa50f80c30105b780b3d0db8d201fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 17756 bytes
font_01_sfnt_off00011d6f.bin
dd83067eb133e7faa5eaf37ab1fe78ce06fcf953ed0f23962bc054b64bea50ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16316 bytes
font_02_sfnt_off0001333a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 16792 bytes
font_03_sfnt_off00014b51.bin
619fb6320e7978d1d7e8271ad63afe82f13aa55a6410084f545cf0eaadaf1453
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 10776 bytes