Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e12708af27a2b…

MALICIOUS

PDF

91.3 KB Created: 2021-06-13 10:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 57a754e5b3a547a9d2a8280d2e19e168 SHA-1: a9ff262c11d7b46200cf9b4f591a71b9a322d21a SHA-256: 169e12708af27a2bf042ea300924f9307a97e08077d96a067d092c056772c14d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=roju+by+chike+mp3+download PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/38b343e047570444b1f42ae7be657db0/buvitilogesodagosobuba.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/74325039784.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2ba06429---vaxavuvozoxinugiweg.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59868059121.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4c2c1ea847efae02550facb3fb1fadf3/31924132101.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0339a0f2---putexamav.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/tuwumi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d345768ce---lopewetomite.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748f05b5d4---xigifipirotinutawotodor.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/922872aaf22aa88bda19000f53cd843a/nesunajupukuwabipixomido.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e702e6e4---62812031652.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/o2lik0lbdqvbp7aeov16noke37/muxifunapop.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/63818942057.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098662f9002b---21159492478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 5684 bytes
SHA-256: 75c6ddd0c902d2a1c39b4dc1edb118c4ece7259e2e459b94e4becd2e673e3978
font_02_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 4704 bytes
SHA-256: 09c3f4e6c535f37878832d9e51164703026361835c200dca01571f3b4e6d5a6f
font_03_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 11768 bytes
SHA-256: f54a64d4f464567f50aee86f84295be08321b81553f695a581480456d4b82f80
font_04_sfnt_off000146ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EC 16548 bytes
SHA-256: a60748a8fbec04778d65f7e3a9b163550c34aef832749b9d827e3bd0a364c83e

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