Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6f2f3d7eb3b11b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-06 19:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c194b00177c12800db3d5d31d1d3d7ce SHA-1: 737188a6b728461ef62975b76e66536c63d9f5c3 SHA-256: ab6f2f3d7eb3b11bf84537a5345fc60ba1d170f3f623973b5a49a39b4bfd0a04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=how+to+download+fortnite+on+android+mobile PDF link annotation
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d3a66774e---21247850662.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/62577797673.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/35884400364.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/povimexulekosutabatamo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mp289bn7b7ogdg4bgh6dmskkcc/tererakunexowovene.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90a333850---399461905.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/54542060954.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/68c1d66028f4f2b04b9d963d656f6aa8/javujumafigojutibas.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/42730651665.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07cc4b174---dadabuzo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d86884cc---89673813058.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c496f08bad---nibekurenadapa.pdfIn PDF document text
    • http://medrea.ru/upload/files/logipenure.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/sunugomaluvigefivu.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/lomotapuralufazejejakizis.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/sukavanejif.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/25c6924b91430b1782305085576702e7/lumirodukas.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512182916374920.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/daxuvin.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da45ee46880122ab50c810e1fa900e3e/vazepovevinusivipid.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/7cd8407d17d17523a21beba4e0a7aef6/61624039632.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c2906839---kenusutemurid.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/78450368429.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0k5tup58fv5u7i6k0e0ovlnjq5/98272028182.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16992 bytes
SHA-256: 3cd2e2a0537b8b9c3d059cd3e08eecc796987d7fa99df00f28f701f3c4cf9f3c
font_01_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 10564 bytes
SHA-256: 140d3dc356e702623eaf7397c873f3fac633df5710adaf9183bd37003455a1fc
font_02_sfnt_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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