Malicious PDF — malware analysis report

Static analysis result for SHA-256 886450e2b565056a…

MALICIOUS

PDF

80.3 KB Created: 2021-07-25 04:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bd36b68ae4d4a1965e6380bcc7f06d0 SHA-1: 7788bed7d892b95762cc8473162159ebc22bc5e6 SHA-256: 886450e2b565056a7333f1f841af2c439112d15c966fe79df7841c39f9daf277
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://kinocosmik.ru/sadm_files/kujubusew.pdf
    • https://tl-systems.hu/files/files/xonerarugobo.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6f1b921fd1aeb03adbf1707fc48e753f/1374772716.pdf
    • http://asfalon.com/__files/file/vabotanile.pdf
    • http://www.bandungmesin.com/file/kosotafabusu.pdf
    • http://blackhorsesc.pl/userfiles/file/rebududixiwukepojepavilo.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/56669468164.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ssasuaoh715m9hnq012av5id9r/wedavutalojawoporiverulal.pdf
    • http://soflocops.com/clients/67403/File/34394586547.pdf
    • http://konyaozgunmobilya.com/userfiles/file/fifasexisusu.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8637becf3---tamukurulikefabidewinub.pdf
    • https://accuratesearch.com/userfiles/file/sesisawobar.pdf
    • http://carsonpokebar.com/uploads/files/81421737646.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0321b947---88529689623.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b72f073f7---21247113914.pdf
    • http://mrpokedb.com/uploads/files/29510116014.pdf
    • http://e-skala.pl/userfiles/file/81434778727.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172a95e203---jemerutaxibo.pdf
    • http://ducnhua.com/upload/files/64943713449.pdf
    • http://creativetechno.in/userfiles/file/xinakigigajukipowozax.pdf
    • http://thedewakohchang.com/image/upload/File/ebujawedavadaxafu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dca0266609450be2332f4525d8c786a6/48455368173.pdf
    • http://axwelindia.com/uploads/rekebuzawej.pdf
    • http://etcad.net/np/upfile/file/882178963.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/menadulunav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=convert+8+g%2Fcm3+en+kg%2Fm3
    • 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_off0000cd32.bin
1c2d5b5d58e2f8ecffe911199005f7083dcf8c033a6ecfc2971bcef462b73af5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 10708 bytes
font_01_sfnt_off0000e5ef.bin
3cd4d369c657b400ed180d2cad238ede43e40491065d8c814e5f7cd4ed622247
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 1800 bytes
font_02_sfnt_off0000ee62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16792 bytes
font_03_sfnt_off00010674.bin
56285717f448f1e94fcef55720367ab532adcd95b58fb8e5a9b5146b5bc8a7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 16836 bytes