Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4d2f3298b21858…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 07:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3636deddc45ba56cc0a47f8fc334ae11 SHA-1: 48601cad8cfa3ec19504306517e27eb14a478532 SHA-256: 8a4d2f3298b218585d74a456de89fca4ccc09a92c896a31dd376de7b20daa0ca
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and numerous external links indicate it's intended to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://renault-service.com/userfiles/fukeretimu.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/92320385962.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/56729938993.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/rakabakefega.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/josbg19sg57pru3qg0bmnbbdl2/pewawagen.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6d8a916ee6cea461e4481958277c79c6/85550113797.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/ramifojasivev.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/57649454405.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/92437185703.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8806aef2---82534366311.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdef33f4b3---19647559098.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/51f477800ff41a29dedf77aa8f1a085a/gupewam.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f330e327e8---zaminat.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/7194542233.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c1e529de---woruvosi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88f2e6e01---71840045460.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/pidodatuvozono.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/xubogujozexe.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/45479308629.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa923474d---67133790770.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/057b0a0adb4bb4cea09b983fd5106c12/nevotepiwox.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a77698ad5---vakorerawul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=force+and+laws+of+motion+class+9+book+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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 11244 bytes
SHA-256: e368c326531b85acbb820c0c31fe00f254fd5135ce9a520092de254b77d1029e
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 17912 bytes
SHA-256: 4f241de02b71a0bf4f98b281bd5ec9bf83d817f61b2a44764edcd502851fc7d7

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