Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c82f4c5441ea2a1…

MALICIOUS

PDF

74.3 KB Created: 2021-07-02 06:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 442ad523c00b7f628ff2ccfa543082a4 SHA-1: 74964fc74b3f91cf789e0e2abcf6012717e28b1b SHA-256: 2c82f4c5441ea2a168154bfd2d1e2e35773d9007c4a9164d879da9a6d9c5a44d
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b5283f60de3ddd6649f028e91b4486ec/55039980133.pdf
    • http://forter.vn/hinhanh/file/1963067283.pdf
    • http://zwickerfoto.hu/_user/file/zuwegimedigolobupikego.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16098dc046795d---kutunini.pdf
    • https://fasaac.org/temp//files/45635745044.pdf
    • http://ahxxzx.com/userfiles/202105/file/sasogorenipojumazunuvo.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1d8a779695245d7365ef1484ef974954/44903382608.pdf
    • http://accessiblevehicleservices.com/userfiles/file/tozovejizataxud.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c7bc2adda8ce124136289250997e3b/62961475229.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e5feb6f9---78824608880.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5p9bfuce3canc5eg2ap0mml5d4/49279994846.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5442d15803794de9d5cd49c56d432989/wamom.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a114d2a1---21897664261.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607179107bca6---nutuxoxefepori.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2a1d63020b11658ad036b7780af007f2/miruwifise.pdf
    • https://migger.dk/userimages/file/noralibudenawozis.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f50ea5aae---gopuvonuzefomopapekakub.pdf
    • http://stpatricksreunion.com/clients/84553/File/60373325889.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce49d89c20---xudesikaxime.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5fa5851a28d8009901f8bd42a47e062c/75581791884.pdf
    • http://wohingltd.com/userfiles/89502714921.pdf
    • http://mbcasc.net/imgs/file/73521570512.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+xray+mod
    • 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_off0000c34c.bin
72cfa66cbd30679cb86226a3a6d0fac2aaefbd55fe27033bd28b9ed3f0ef5850
pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 15880 bytes
font_01_sfnt_off0000ec4c.bin
68696ef5188810398fb4932e6b31992f1e5b2864ff2163e83a8814e1a0147d8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 10572 bytes
font_02_sfnt_off00010470.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 16792 bytes