Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae95c2ed77b21790…

MALICIOUS

PDF

73.3 KB Created: 2021-07-17 12:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e8624e892cbccb18c798e9ef6cb93f3 SHA-1: 13270f15fa18cefd9aae78c6690ff6286d39282e SHA-256: ae95c2ed77b217902d7d86a8e74d4c34aff10ed43b998eb7dffa36638909aada
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://zamokugrofa.sk/admin/fckeditor/file/42961902838.pdf
    • http://angelcabrera.com/FCKfiles/file/17494278559.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e882d16abc---89531953752.pdf
    • http://hyundainhapkhau.net/upload/files/27990170608.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3d40422a0a98c68ae6166376a9e991ef/97238830605.pdf
    • http://iworking.vn/uploads/files/kupemesojalam.pdf
    • http://naviway.su/upload/files/guromenabakelada.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a1cee9fc8d74501d2ff812b070d4666c/79561926676.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb10f0ab65---11902278915.pdf
    • http://cn-junsheng.com/upload/file///202161523018745.pdf
    • http://aan.kz/ckfinder/userfiles/files/30418214236.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/35b99605f1e8073b6c65353ee11321bd/pojuriw.pdf
    • http://munnarinfo.in/userfiles/file/43371584118.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bae3d5438---73675173034.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/eae7e531fdc8fdbb4ab30534902773eb/82805166782.pdf
    • http://liccuza.ro/stiri_files/file/38827853184.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1486d1971---sofizosegejo.pdf
    • http://raczcsalad.hu/files/63780595510.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=seed+of+chucky+123movies
    • 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_off0000ba7d.bin
d61c465793cd2d1793ff9b15f52e071598ba18dc8900608a7eed5aa4b8a5507b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 17072 bytes
font_01_sfnt_off0000e6ba.bin
c5bd954a5bcfb1a492cd5d26941edc6f4756472e70b817db993380f4d8fdcd7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 11020 bytes
font_02_sfnt_off00010083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes

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