Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2769685d8c12e4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 08:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53262c6481d07e968305a6bc19bd2c4e SHA-1: c5a8eddc4e2e5600322a53dbe0c37ee8626aed1e SHA-256: 6f2769685d8c12e461eeb5fffb5977eb5bb3f974e4b62d39f81fe93ab5c1b783
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on potentially disposable domains. These sites likely serve as landing pages for phishing attacks or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2271cc88f775f7ed4fde35e594d5679b/sutelumifada.pdf In PDF document text
    • https://vibangnhadat.com/uploads/files/mirorokad.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/marevasezi.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/96412470310.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210915_103326.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/sanalo.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/31526604242.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0nd3to06pnpekkp3a972ppqhv7/7844933623.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/bujuko.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sumibawuzobiwamov.pdfIn PDF document text
    • http://ashioke.com/images/library/File/52357584607.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/redinijoxemuxetogike.pdfIn PDF document text
    • https://carlojans.com/cms/file/patodojutitutolet.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/37549567535.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/zagotabinusa.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/xunedefasimulejunufedepad.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb18e4514d---lunaxe.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/fatofe.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xiweleregibixikomudoma.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/wivugigifoxikesosivilu.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/52552924937.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210910042103.pdfIn PDF document text
    • http://esteel.my/userfiles/file/diwomunadutexikiref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=alien+zone+raid+hackPDF 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 10332 bytes
SHA-256: 09631505d08c8bea635e5814d61290110062263243f6bb5c1b957ab8da68937c
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 18084 bytes
SHA-256: 40e87d622029f971a4b19ee1f687135f179754622b80a2420961ebf849357c59
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1