Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bd5f1253ca0e60…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e856d257d2adf0b9b24de9ec5b13d20 SHA-1: 7ac9eba73d8b27e09d1cffd110c139c952967d7d SHA-256: 77bd5f1253ca0e6023be352f5a15cf4a3f7ff1d0b5896939323b12c37d66e795
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of 'SE_PASSWORD_ARCHIVE_LURE' and 'SE_MFA_LURE' heuristics indicates the document likely attempts to trick users into providing credentials or MFA codes, possibly to bypass security measures or harvest session tokens. No scripts were extracted, but the overall structure and heuristics point to a phishing lure designed to lead to credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=tab+appointment+book+luxottica
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082588ad1078---45660154020.pdf
    • https://mfdesign.hu/files/file/bobatubuvifoduwin.pdf
    • http://jaatkinson.com/userimages/74602897005.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b404a9c83---71396415884.pdf
    • http://personnelstrategies.net/userfiles/file/pomowobo.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90a63afcf---51093953244.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/87031167370f8d697c3ce427c1a2adc0/98992393699.pdf
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/gidisibipazerepukirewev.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/39041622120.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//5216215931.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/248f30bbce91c76012c3e85f5d17f4f4/83968191527.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070436f51640---33221179581.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e3b793fe2e7d40c7c4042a920eb6c2fd/rarofimurofunalawen.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086e081a2000---80976837610.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2b33d13ecbc6921877ca360f365d0f3a/nupekatewulemitumeputoxu.pdf
    • https://associazionedynamica.it/uploads/file/zasonopoxuritedanex.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c032b1e93a---sabaxiguxutifoz.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d24a50lsrkb0o6flpnrta9p333/toperipogosebemasakelag.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077520153f91---ronevimobipudaza.pdf
    • http://trendymamy.pl/userfiles/file/63121140784.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b853de64---tawobopanoza.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a309563fb---pedinetiwuzu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739553ade70---35059471475.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c256a1c2ab2---62702617905.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a50a0ff55f6cf798da73e8000da8e984/pezamurola.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
font_01_sfnt_off000109b1.bin
09b689d10bf8e420a4aa6935339efafb1997e2204176349cfe25a400393feede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10664 bytes
font_02_sfnt_off000121ea.bin
720db1667728ca450dd7caa203bda9ba297f182297f508126662dfa9cf2af412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 18780 bytes

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