Malicious PDF — malware analysis report

Static analysis result for SHA-256 220d4ea48f40b00e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 07:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cca567a1d40483e77db6c58a5c0e0be7 SHA-1: a5cbd9ddd6cfca37a7c6e557b7ccaf77d76509d4 SHA-256: 220d4ea48f40b00e00a4b659f1c325aaab7a345c0a008e80689110e1724a2599
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing lure. The heuristic 'SE_MFA_LURE' indicates the document's intent to harvest credentials by tricking users into approving MFA requests or entering one-time codes. Numerous URLs are present, many pointing to compromised WordPress sites, suggesting a distribution mechanism leveraging these compromised hosts to serve the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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=fake+cell+number+to+receive+text PDF link annotation
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e4eac2e655b---ligobokofewefaga.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/88801912803.pdfIn PDF document text
    • https://mszukam.pl/dat//file/86875679245.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/80949312107.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/wevapegefagidabowenuzelo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113011b45769---vekuzazepukumezadevug.pdfIn PDF document text
    • http://kelvista.lt/images/files/17404933657.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/wosepovuruvoniro.pdfIn PDF document text
    • http://aurora-c.jp/files/files/rojalurezuwodelalinunenu.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/lupiwube.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd107a868b---vixijosun.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/53959330236.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/449180a17ddeca06878db13b32bd9180/xevufegejatew.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zijuzominudorojado.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/rimasanamipavobepomogir.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/muwagovavuduvavotediwabe.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/58211200843.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/74512857124.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/52041051355.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4577b3f6---xififefumono.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/98869614800.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0qsu9ppjvklo42177cjl8vnb4p/80272168669.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98c25736a---zorag.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884960c1f82---susapopasenawukemofo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/86643402874.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/nimaxa.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_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 10700 bytes
SHA-256: 1e248ea16438b06793aab3721d444ebf98b1d45f9922a005b07b56bbaa9abfe9
font_02_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 19116 bytes
SHA-256: d2921da9067c300ee5f25ea5eb0f307f6d9a26bbedd257a4a0ceaf3272063aeb

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