Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ee28ace892083…

MALICIOUS

PDF

75.2 KB Created: 2021-07-24 19:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baed21755db25657fed2dfe7bd473e1c SHA-1: 238e83db8363adca45fde9169cfe53b07a1dc19c SHA-256: bc4ee28ace892083a8bfa9f692bb717fcbac7c692165ef3c54fd9895cd0b6cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://eseninternational.com/uploads/files/sufotarepapexisir.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a175cd91b---xezevegilivolefeberukujod.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/66eaa4d6558c26e16eaa9c5cd05ce912/zunasefizajavo.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c88325612c3bb84c70d5f7bedd397e28/baxazijidekewa.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0aa9b3b1---jisipipukinojamuruj.pdf
    • https://rugsinc.in/UserFiles/files/76282830050.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c1d1820d---2055296884.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ak77scc06d69ncdunk0v7llh43/23051437246.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bf1bb5a8d126e92222276d4ff61bae42/xegixotibokutemuginuzu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b917d5fe14---85029159596.pdf
    • https://rinducm1.com/contents//files/93697805636.pdf
    • http://garage-fuji.jp/js/upload/files/betulibateganomenipoduf.pdf
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc24d87ee---letusenuvokufufu.pdf
    • http://hieuchuan.com/upload/files/bunomofasokokitigura.pdf
    • http://ginzaoakland.com/uploads/files/46747005555.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/77425710669.pdf
    • http://eprdel.cz/userfiles/file/buxuworaxabanetuzekefalo.pdf
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/zelaziwidaka.pdf
    • http://brmxn.com/userfiles/file/20210630212616_6pm2uv.pdf
    • http://vizugy.hu/uploads/files/9472180296.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5c5d5fe8847d616b19fb83347665632a/xolisizemewukegol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+descale+my+lavazza+a+modo+mio
    • http://s292376414.onlinehome.fr/datas/imgmail/file/44585676738.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_off0000c352.bin
35c302a3fd3af2460adedbec6fd47f8fa6d2965125a245de75fd35c3ffda63fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 17252 bytes
font_01_sfnt_off0000eec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 16792 bytes
font_02_sfnt_off000106dc.bin
418102e680bd3fa8de306c7dceb82e074c20669082ec209022714b9d30f5bc87
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10644 bytes