Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4983a66cd8483f…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 19:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7ecd2cdae3006904a7ea0f8d137bdde SHA-1: 07f3e60a82e63b44531520be4a2d903b1c325c64 SHA-256: 4d4983a66cd8483f3c794eb87cba1523ac1f67ab32d3f06fd3d211946a11c965
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1555 Credentials from Password Stores

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and potentially disposable hosting domains. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or abuse multi-factor authentication, likely by tricking the user into entering sensitive information on a fake login page. No scripts were extracted from this sample, but the overall structure and URL patterns point to a credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://archism.ru/uplcv?utm_term=google+services+framework+4.4+2+apk+download+for+kitkat PDF link annotation
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/24fdc02d70cacf5391f2b539eeb91c18/34022183140.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611453e537848---44408051204.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609078d6ecd35---87850265166.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/60626994607.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/17417055615.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/tagoriwigetos.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71151ede34---xapifanilo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ad74c597fef---71087932648.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/jewusemeni.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rfiacc5gkjga285smudjh0cf3i/58045784239.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/39594635076.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/noduvizeva.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/76550036453.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8300664471.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/48842961724.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078edd088824---35047688192.pdfIn PDF document text
    • http://indecomavo.pl/inc/rokugexatawuxiweviduvuva.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tejoziwutomogebexefipude.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/feraj.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/74623575219.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/kevujolokug.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/68763304752.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/lokefejerufexorokefazali.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/39599646481.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b285face737---mimafozawojakinulogomi.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 11512 bytes
SHA-256: 252ad02f1cc09e4cc2673fdc67d561d2b3a782f268342948a27f58bc086c93eb
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 16372 bytes
SHA-256: 93cb86fcc37f11592b6faae6f7fa1f9ce8a9ad5a30487f305e9813b851601062

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