Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fb6ff6cbd82752…

MALICIOUS

PDF

104.1 KB Created: 2021-06-29 15:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a931e35ba26bb9d73402c2755dd935fb SHA-1: dd3f00574b91ada24353ac3861d946484e896a86 SHA-256: 40fb6ff6cbd827523bfb7c84c40df0190a2d820675dab4c472f5e6f9d19b1466
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of multiple links on disposable or compromised hosting, coupled with UTM parameters, suggests an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://anmimar.com/royal/userfiles/file/rogemodi.pdf
    • http://laclonghotel.vn/upload/files/kerugumusifirobizojuzevi.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b82m8p8cjk91j3nm5crm0ie0j5/85795830382.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544c42eab2---41284459329.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5ae5dd96b---romuge.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f1340bd50f211b6016412eca85033b9/toxekafis.pdf
    • http://abacusnancy.com/userfiles/file/65736564361.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86c32c89f---94626062073.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e197ffdb---gajidutumovujusinemijowur.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/93fb8843d6e570188a905c9eddc50a17/kerisotokusomuwexi.pdf
    • https://ratsimae.ee/media/contents/file/kakabubibur.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160867dae6a5ab---sewidovepesupagalef.pdf
    • http://illinoislivestock.org/userfiles/file/giwusalidilerajibigifa.pdf
    • https://paklya.su/design/img/upload/file/dawosopezada.pdf
    • http://iwishop.hu/file/2217111417.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42730ae58---19060401798.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607426ec3dcc4---bupamilowutup.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8at26e2j9sonk6p1bhnn5rlk3c/fugibujoxunurekagebuvos.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b735e7be5e---zixidoremadube.pdf
    • https://ewastexperts.com/userfiles/files/33474043121.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/31anvbaiqljndogipl13mja1i0/36663485534.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/45451573560c3dcbe8a0e3.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+kingdra+in+pokemon+sword
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011431.bin
94322246b422ee16eb0f418d0934e1734b0884e530f6856f12b5f76a0b06cb7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 19384 bytes
font_01_sfnt_off0001467b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1467B 16792 bytes
font_02_sfnt_off00015e88.bin
6700aa23ab5b9b20cb4ad0574085b806ab995670495b42bca3382a290ed76d39
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E88 7140 bytes
font_03_sfnt_off000177d1.bin
2c2e4237a1769e297ede51b66125833f1c3ec994e8e78c039d70e65ce2a60813
pdf-font-stream PDF embedded font (sfnt) at offset 0x177D1 10856 bytes