Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c27c8653a710cdc…

MALICIOUS

PDF

96.9 KB Created: 2021-08-17 12:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d89d935cb08b9a75d1657ce43720824 SHA-1: 2d4c7016dea43d5b8fb779eb63f8d245298ab1e8 SHA-256: 2c27c8653a710cdcc15bce4620d36fda49450cf5b938c43b07008e887bf175ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2380v3tmhp7dd6teerhi9sd5a1/92376333216.pdf In PDF document text
    • http://ginzaramen.us/uploads/files/79469500400.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/30536592295.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa91d3649---moketojugetelituwoxuz.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/95122571134.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c629aec9daa---sevefetatalunivugutigemod.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/sabegobawikepafusokiwami.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/30611070946.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eddd73b71e9---nepizidevumujuvodaw.pdfIn PDF document text
    • http://greenld.com/userfiles/mepexazasofanujedinudo.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/ronozaxoxuxosogesot.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/jagojegunaragulif.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/12932924849.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/81251286909.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/balaruke.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/napirotuzulaxexeg.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/63695701972.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cdbbb9c8c1afc702a6b88764f0d76210/rexoderapero.pdfIn PDF document text
    • http://e-hane.com/files/gidubi.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/forufebifo.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/naruvojebepepuz.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/65304264662.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e666426d06e---tadatarulufatizij.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/5426610132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+code+in+roblox+speed+simulatorPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16288 bytes
SHA-256: 2855e61d3adfca4e863148ada1a39951c3dab74b18f14cc53dd016af0b0fcc67
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 18052 bytes
SHA-256: 49bf7c4629308a49cdb062c37d8bc2367126a8ca64bba7d704dbc05c7b3e5dfe
font_03_sfnt_off00015a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A81 11276 bytes
SHA-256: 444ba9bf87f9ccb5be4efb71843d60c8048e478d7099936bea6c665ddd03d659

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