Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fec68564f656c69…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 09:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e035ebad32bc8cd1b61f4dd5b1979b9b SHA-1: 67a28e1bc646aba439be6bde2c657968214838a2 SHA-256: 8fec68564f656c694ec9e7de473e2d27514c41c0ccb3343f269ec67de0aa5e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential exploitation of PDF vulnerabilities or social engineering to trick users into visiting these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16093471018a1a---tekelalovafovaxixepo.pdf
    • http://driscollandgibson.com/images/edit_images/file/11410413226.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160743d397bb34---37770165393.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/52f2a72ea361ec60b8f58fe52e1d29c2/42145330515.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee7f0e1ca0e2991f836524a65223b58b/fuzanirejukonadememezapef.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n8srlqaktuts44ovs29b8mc394/48056546596.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d346fb1cb98165ccc75262a3b4d12d91/54602869783.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/f4np35htaikgveg5s44lcos2df/27745400395.pdf
    • http://aj-logistics.com/stock/userfiles/file/fasavik.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1b0b66b81c3973ea994617b1ebfce67c/pojadobarepefisuxun.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/afa3416b00b5105ee9aa52c3d565e368/90621018107.pdf
    • https://xanbiente.de/userfiles/file/nilenadiwu.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b5c177dd---45595577118.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a9c997fc---87455332551.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cae7ebbcc---kaxifawubokojidomotu.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e054e487eec1e57d381b5b4061739613/71388686122.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fd762719c3a03dd110e7be8280548025/55175551400.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rk1imtvdoqjaaimfger7tn00um/nobugavixanefobewunixegup.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/3893077589.pdf
    • https://securityguardsupply.org/php/uploads/file/72230690779.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1a539894---lafarigotoj.pdf
    • http://dentalcenterstudio.it/userfiles/files/gabimevavutos.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/jokudukezawebaneje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=give+me+the+answer+of+the+question
    • 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_off0000e953.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 16792 bytes
font_01_sfnt_off0001016a.bin
4632eee96e7855e61bd5a3049431cb5abbb286a9698c493893bb7bd260f718a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 10872 bytes
font_02_sfnt_off00011a74.bin
6f2237bb8f1ecbcfc5fde77021bdfae3f43d973e1738547669f811c8c9410dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 17180 bytes