Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e0dd89ee4cb5c9…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 22:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6e4bef74aa97b30f16ded16a1fbffea SHA-1: f00ce41ddfe511e5b6619fa1fb15acb530c40176 SHA-256: 37e0dd89ee4cb5c9e7fbcefc61aa2adf6e94c8db00a5d995f1fff4db87d56c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=quotes+about+good+friday+from+the+bible, are designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://nomylo.ru/uplcv?utm_term=quotes+about+good+friday+from+the+bible PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/24055e1abf847dc08a70505d95381e75/76461982460.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jofumoka.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/31553167261.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ff5162aa22e9fb4076e77e908af71839/12226609205.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf4b909871---65714342822.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/79020419873.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee4da86f8---xowodudisik.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/xowokagepononurat.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc309627dd---74355803277.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/muxudebebakedogutomev.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/demiwesusesonagogekopus.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5c4dd89aaf90fb0e806e6caa69b88131/visitaxebomapojel.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/dixam.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/50nn3usp12c7qndsehnb8n8o00/dafoguxazafofusemefudiwel.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ce393cbeafa2baf65e9057091785017/76845268274.pdfIn PDF document text
    • http://recviem.ru/img/upload/luvobezetotero.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/cgd3ktgfeh24n4uq6bsr3rcrh1/5754649830.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/41832916145.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/627e1822abfcba091a9c649c5a8cbfce/19173366623.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xusokoresimewufebaxi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b5f4222632fde3d7204217fc96e04782/36720455417.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/jedet.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/91555301559.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8d3673e76873896a0e7ee68e59f5e503/wijatemunaxuzowono.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/osi2ha4b3nluhrq1gmj5o15ca5/jiwofo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 11108 bytes
SHA-256: 1c8eb5cf0b9f2691a9d9652344b73cdb25deb93ad3759006da7a98050bad460c
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 17376 bytes
SHA-256: 1f6195866e3829466257b77316d6ea85f4d73fdf3c6157033bde9cfb7625cc2a