Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a78f42ac272c6a…

MALICIOUS

PDF

183.0 KB Created: 2021-08-01 06:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c9a26d0af730b0e81d1101b5e62ef6c SHA-1: 603bbe25a915ff40a454b1b80cbe69040b246117 SHA-256: 89a78f42ac272c6a6e56e657bf129b31b8689e19a1cd29ce5f158088168c2f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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://barrierball.cl/ckfinder/userfiles/files/337453896.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c3e8a908962421b913f8a8a79a1cdadc/xewumureliga.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cca5a12b8---56558173264.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd006eb712---wegifowevakalojoxepip.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/furadanov.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56332c83a6---mojolemiv.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s0cqfv65amslv91aiaemqenj2a/44770952307.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/44878985853.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/81c5bf8dc81109330788aedb5a5304f4/vukevojemasunu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c933214e1---vegogene.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160810017c082a---disenevu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b3cd2410ad44127b04df5ffbd0287b4b/jibizawutoragawotupanu.pdfIn PDF document text
    • https://birudongker.com/contents//files/taxakatilirupoz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zojotisowusitexujuj.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/759b3c16f7f8e04830f09a7af7430301/wenopudusaxaxo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/32b800a6abc3d62b6ac8e1a0fc100fe1/93785787327.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210625191306.pdfIn PDF document text
    • http://crediramasrl.it/public/file/68017335593.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a105548447c---23118134820.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/739701fb0da07b7d5eb8450e56d9f257/meletanunodoledulabiwon.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/13575176514.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/98278530620.pdfIn PDF document text
    • https://ibextrail.com/editor-images/52185692389.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/navowofa.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/fipojuwowopatu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/2776708192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=why+the+book+of+enoch+was+removedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000248b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x248B1 16572 bytes
SHA-256: e167701e1be821b29b667e6f0acf5bd5689ec74ee86a4b7c3592e09733699f54
font_01_sfnt_off00025ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FF1 11096 bytes
SHA-256: abadf016c11b8c1c44748ad06ea6a1e73f67a5d03c58a137e5dd4ba59a836763
font_02_sfnt_off000279bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x279BC 24228 bytes
SHA-256: eb57476a0193d84a37224ab16119ed652a98300021f4def16405fe3bf2d9f9f9
font_03_sfnt_off0002b592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1