Malicious PDF — malware analysis report

Static analysis result for SHA-256 57677fa2a843934e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 14:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4be890071d92ab399b788e9b2f7a27a SHA-1: e4e147d0b9eb0b21eb38026580efe64704f62256 SHA-256: 57677fa2a843934edae7ab0d34e15a2c0f664dcf8a8251537d1809600be8f264
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or session tokens by mimicking an MFA prompt. Several embedded URLs point to compromised websites or link farms, suggesting an attempt to redirect the user to a malicious site for further exploitation or phishing. The document's structure and embedded links are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ckmandarin.com/uploads/fumutipidanona.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8177321a582ba081fcb2b5a746a5e4f6/64986691692.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/xezigopijaj.pdfIn PDF document text
    • http://minerva-collection.net/files/files/35355998666.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f35dc998c---jasifuwosipukuj.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052202522273499.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/rijutunedigejiwi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17aac8959---28619087001.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/zedusadenolanudawini.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609211948592e---porifewugugomelukazibav.pdfIn PDF document text
    • https://castel.ro/userfiles/file/98584381323.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/gapal.pdfIn PDF document text
    • http://kodemari.info/data/files/85168046794.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l5frvv3lc51ph6ok1plpf7334c/54014688475.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/8497820638.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/xajafifofepuxizikav.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/76b2d67b8339544c620668a7f4f29976/xadisodopexidi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/zogawefugelamareku.pdfIn PDF document text
    • http://jump360.co/upload/files/20210608163656.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d389c0fa---24991946779.pdfIn PDF document text
    • http://indecomavo.pl/inc/46965728679.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/15iremj7kvanb70pct39n85g63/8071022084.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xizifigezawum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nsfas+parent+consent+form+2019+pdf+downloadPDF 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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 11212 bytes
SHA-256: 6ca54ba0f79433ca702d3ab1b441420d12115416fe3224c2193e81fd698a5d63
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 18300 bytes
SHA-256: d745b355392a61414d086cee5bee27a963ac44d7f8f47fd6932f7b7188a6ec8c
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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