Malicious PDF — malware analysis report

Static analysis result for SHA-256 42da68e06dd97b60…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 12:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f00e3db871481ff20b8da081c9d55c1 SHA-1: 629078b59d5fcc4a983a345b3394b9cb0e263227 SHA-256: 42da68e06dd97b60f46c1f640525b1b8935d15cd998cde5a3ffec064b495d889
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and links to multiple external URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/19r3r2b1ohea03l1dlijp0t6i2/zixodorij.pdf
    • http://lifecare4all.com/upload/files/vuwex.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/24346097571.pdf
    • http://csc0851.com/userfiles/file/20210921053833_njy1t0.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tokggp6fskk4jq0rp7t38qer06/40626740646.pdf
    • https://kermoulin.com/userfiles/file/meruzel.pdf
    • http://lynhuagiasi.com/Images_upload/files/81349712361.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/xelilofoser.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/zominemuzugamupisi.pdf
    • https://rhodium.vn/uploads/news_file/70350562269.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/misozedulavokowezamefiz.pdf
    • https://lecachet.fr/docs/files/89543818754.pdf
    • https://ambulatorioveterinariosismondi.eu/file/xijebojugidagoned.pdf
    • https://bestcoloringpages.com/userfiles/file/50222211173.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0d9c20b9af8da6ea1fd849d7d94af7ee/fegatikisubewowanuf.pdf
    • https://krossi.ru/images/content/files/42491576780.pdf
    • https://anfauglir.com/images/file/bomivanomijidupirogurizup.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/85ce4723d1f1d0b666c7fcb944ed7f75/vubivedo.pdf
    • http://arniestribu.com/campannas/file/69637269342.pdf
    • http://kurumakaitori-one.com/js/upload/files/66385680750.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_A6D8BE3FCE7AFB1D.pdf
    • https://tarzminder.com/resimler/files/13176118319.pdf
    • http://borik.customreal.sk/data/files/9279984155.pdf
    • http://civicwomen.com/ckfiles/files/63395244393.pdf
    • http://okfilm.kr/userData/board/file/nukuzi.pdf
    • http://jpind.pl/userfiles/file/xowogasaz.pdf
    • http://chromavials.com/d/files/rilodezif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nicki+minaj+songs+download+mp4+download+mp3
    • 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_off0000c7f6.bin
a6291b8c0dea9d90750ea2f3d4fc25220cedd9055a0682f50b517a9f5ed03d42
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 11060 bytes
font_01_sfnt_off0000e18e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 16792 bytes
font_02_sfnt_off0000f9a0.bin
7028767981f170989f1f5427b917edc4576e98e61d31a21a62121a9838260b44
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 17496 bytes