Malicious PDF — malware analysis report

Static analysis result for SHA-256 2073e1518e99dcd2…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 09:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4819e72d3b9718e0dfb8596d8f98d541 SHA-1: 069dbfcbcf5ed8c0239385a8ef8a914e6e3ff2ea SHA-256: 2073e1518e99dcd273bfcdfbd1e9878eab8a5c68a69beea303b73458554e43a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings point to a link farm attack pattern.

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04266ccea---kesuxoverurijosota.pdf In PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/wibofeledajorizumu.pdfIn PDF document text
    • http://lscapital.it/images/file/zugifu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/wasudirajopef.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a7f997f79---bojidobunepojanogaji.pdfIn PDF document text
    • https://lemanssrl.it/file/bisuxewinaxowefajopag.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/75883412288.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/074feafc88376084db3640defea0a19e/36126804240.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0681e7a219---mawititunojupuviralategob.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c0a73484893653c4f571c8deeb6bb2cf/82509170255.pdfIn PDF document text
    • http://limoride.net/gallery/file/jogudukaluwivifuw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7777ff6c---bunekudeg.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/27665518776.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ed095d3c0d0dffce2fea147d4ba8de21/67478086067.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qlars75enfrtip0l4q3vovaokg/sipinot.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/duduvi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa576be5eb---21461217177.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/lipabimapumon.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mezalikitisowigojotop.pdfIn PDF document text
    • http://kelvista.lt/images/files/fisijalipilizufopud.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xedunuvinenafexujomu.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/90407078092.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16118a953073ee---97009406931.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d05476505---40419397606.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091187449a0a---fetitozogagetub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=self+care+worksheets+for+youthPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/kapeluxubuzuzezokifepegir.pdfIn PDF document text
    • 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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 10704 bytes
SHA-256: fa8a11df955b96c2ab3fd0edd52b7faa4d4f0f4602cedcb39b2b1c50b26df2a6
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 19016 bytes
SHA-256: 95e05b0081abc9771ed30f0db5b72ac94d6889f1c2cf6aea771a7dff0a8fa1ab
font_02_sfnt_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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