Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd541c8b0f950622…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 06:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4233903997acded1aa9ce1403bef06a7 SHA-1: fedf52795b7116d8c3465e317ebf8f22c6afb659 SHA-256: fd541c8b0f950622b6f76ada526fbb4134d235b841fc6d0650ac694582b072cc
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF structure itself is also noted as having duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0198cebad8---bazobukewuzuvesixikazobof.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097d143e48ae---xesoliroz.pdfIn PDF document text
    • https://alutat.com/data/file/3377916301.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/meperuzabifilimuzuxideru.pdfIn PDF document text
    • https://wsbtitan.com/images/file/sumodivurelemexiz.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/50478503464.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210826_479A1C0DDAA81FD8.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/digovudiwotepa.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0b899db330471df8b50e4f166d84fe41/rojuz.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/sewogujimobelufutepafiwod.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/62023667201.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4d1d8786---970709393.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/fojewasezilelogaxulumo.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/tedopuzezolotalegufaritip.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3795aec5aadb72bdace4250c48596779/texoxiravasojuti.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cae6c1739db5419abb25262b1d2d2c16/66346437493.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/273be2d6fb3f7fba67b6dffeda3f2760/90372746018.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/bd580ad2072fae1feeaa58eaaebf12be/71115151326.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5gkpss8amsn0i4hbmbleadts09/6234799870.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b059e426eb0---86506407947.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/51547784119.pdfIn PDF document text
    • http://atrsara.ir/resource/files/16014533551.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/29274782984.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/61662728226.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/sibofadapunumumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mckenzie+method+back+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10856 bytes
SHA-256: fbcefbbeab772737caf889d20e1c9f758b6a9dfd81736809d3e524103ba80111
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 19620 bytes
SHA-256: c4d7c65552d9ddceb79174e68a2d93d135c2a1cd677a01a88b45145e207ec8db

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