Malicious PDF — malware analysis report

Static analysis result for SHA-256 9008a42b50810360…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 01:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a01aca7af083f22a7852a4f4acb42fb6 SHA-1: 592facc8a3ca8f74743b137b940c5ff8e30b7450 SHA-256: 9008a42b508103600df660de9ac2964cbb2e4058d48c302b4ae937f75af0eb8e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a screenshot to mask clickable links. The embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=youtube+music+premium+cracked+apk
    • https://rrr71.ru/upload_picture/kikusavafujakodazamavo.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210911_5D0BCDD432E35DC9.pdf
    • http://blueview.nl/app/webroot/files/userfiles/files/vonobaravosased.pdf
    • http://thecargonepal.com/userfiles/file/20795623828.pdf
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/97144558025.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/81260113359.pdf
    • https://www.stnedu.com/ckfinder/upload/files/99185876984.pdf
    • http://michelschuurmans.nl/images/uploads/file/bavewuwokumibejela.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e794b278807143ea3549e0d5eae4a495/42576343777.pdf
    • https://fong-cai.com/upload/files/zufon.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/50120120846.pdf
    • http://mskabel.cz/UserFiles/File/fedofinesukiditaxufes.pdf
    • https://kodcomputers.ro/2664/uploads/gevirifafuwesudupuj.pdf
    • https://daqing-jewelry.com/uploads/files/202109180705019285.pdf
    • http://ogcdc.org/uploads/ck_upload/files/kebutigebulewijukopeximi.pdf
    • https://maintogelonline.bet/contents/files/wiwitekiw.pdf
    • http://liqaa-lb.com/files/userfiles/files/21740030472.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/mudematu.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/40574592044.pdf
    • http://9y.bfage.com/upload/files/20211001052306.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/bewugofolabemegu.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/7447901070.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615220ddf1b9c---juzidenorilemok.pdf
    • http://daltan.hu/userfiles/file/tejexerixosidef.pdf
    • https://groupunsur4.com/contents/files/56981009050.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1bi4uhaq7n03fgqi3edbdu4kbr/60521860383.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b218.bin
43a6b0c9a37d8e7d5c20a62f37122c63bef22fb2781bddd904cb79650d5f2844
pdf-font-stream PDF embedded font (sfnt) at offset 0xB218 10840 bytes
font_01_sfnt_off0000caf5.bin
81900d4d678a2d0e056353354ba1f48061411324cddfdf2a9d27b7910285d5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 14112 bytes
font_02_sfnt_off0000edb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes