Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aee0217028c328d…

MALICIOUS

PDF

99.7 KB Created: 2021-09-07 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a109732fde84a3a542f226d1592828b6 SHA-1: 06d211b3c6ed634c6c3bf0e05e5cb69383975d07 SHA-256: 5aee0217028c328dc0c319abf2318f32ab35acdbe8aeff7a53f55d0bd25f0999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://pistant.ru/uplcv?utm_term=rei+lear+millor+fernandes+pdf PDF link annotation
    • http://sghr.ca/upload/ckfinder/files/nexizafe.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/mojobosorujuxav.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/felukuvupusafijefu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/adfba648b28c2badff1fc5e6e3d9f484/warisetaruxaxebaxefer.pdfIn PDF document text
    • https://eetravel.net/file/17074882460.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/16632416564.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp33neapcm885jigs5orm85fm4/22556474738.pdfIn PDF document text
    • http://cx-gl.hu/images/files/59532173986.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/74194616337.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uqtr8f14h1a8vuba7on2nbi7i2/46139718595.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac792ca8c3---bikijemunireruneme.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61a317b9c---78039825203.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ffa3c0c8bae148ac314f057fb6bc38ec/15083289437.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e7fbdf60642de7b0aabae685a0b2b97f/pekekononobipejedude.pdfIn PDF document text
    • http://atek-ent.com/upload/file/xapinogeleresukoranodefu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b6a6f607457fc2916bef23226ec98d8f/dipexumubozitiwaveworag.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/59555803795.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d3f348e53---15454530907.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/libirave.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/78846626528.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/fijefudivexifufesaf.pdfIn PDF document text
    • http://vodnik48.ru/content/file/49010901708.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/gulebebanarokevewa.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/76759370206.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa81a0425---dujot.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_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 20888 bytes
SHA-256: f1a32c04984442eba8076bf4d9eb9ad28b998b8510514ae960688b81df0ad866
font_01_sfnt_off00014f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F36 10604 bytes
SHA-256: 50a970965c3e725c3219d3c795b91080a596b616428ed1cab213706c96a0f20e
font_02_sfnt_off00016755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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