Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6cc20f4c5b42b7…

MALICIOUS

PDF

91.6 KB Created: 2021-07-25 09:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eebb133a41d68500fe9342c98cba7cd3 SHA-1: 6de2c99221f7e1fbb95eeaedd12c487722410967 SHA-256: ca6cc20f4c5b42b76322f92f99f08d8bf59b8bf1717d52b03348110abdf6d3d0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://tvkinter.com/file_media/file_image/file/1819414621.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d9fcbdcc24f950eab1f47b51b179226f/43709318999.pdf
    • http://czdashan.cn/uploadfile/file/2021052719033673499.pdf
    • https://equator-maritime.com/userfiles/file/89792862708.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e97c18a0e---53133279005.pdf
    • http://campfirewtx.org/userfiles/file/xukivigifagukubonipaj.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/xoxejizuxibiviwipojoloruv.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5fd082d0f2e56714dd9408ad859cefc4/lenurezetofapelavavinopas.pdf
    • http://jjmcp.jp/userfiles/Image/file/68627887769.pdf
    • http://batiment-tunisie.com/userfiles/file/nabenidivuni.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5c9002ca146e4f1aadea463bf10fc6e5/nulilasuboj.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/45740162449.pdf
    • http://rfychina.com/upfiles/files/16250699926949.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608535ef05f04---56642246079.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844f916fd4---lujexo.pdf
    • https://hagepoorter.be/files/files/xolejowatafobufesoja.pdf
    • http://www.deewanalarab.com/up_imgs/29993248453.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b48855b721c---merana.pdf
    • http://pantipplaza.com/userfiles/file/gomuk.pdf
    • http://londonjip.com/userData/board/file/8607353967.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149bdb7e81---tapos.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qvkinkarheio37c1954sjad6hp/binipisaz.pdf
    • http://bezagsecurity.cz/userfiles/52409050182.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mod+gta+san+andreas+apk+data
    • 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_off0000f8e3.bin
a5b67dee6479b8c501ecc85f9d905bd306a237c952770b32d253af01f28d3671
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 17704 bytes
font_01_sfnt_off000127a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
font_02_sfnt_off00013fbb.bin
9f565e8d41921d3d57c8a2013c6896f9b5d20568aabbcadf541cfcc266ae9ab1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 10516 bytes
font_03_sfnt_off00015793.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15793 1732 bytes