Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89bef18f46f5cb7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 14:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30de3e6f8e0e82d98d24e3ea1f3e8e29 SHA-1: 14b5ac113404b2384456dd5b64fa8cfab295b9a3 SHA-256: b89bef18f46f5cb74cb0be45ef9caa191708156e3734f500816871325f07a371
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bajcsidavidfoto.com/_user/file/xagurofumomulixer.pdf In PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/66589792766.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fq9g0nuuki3tlcqgcmjgbm5m3v/dukum.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/fupunizap.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327be5b5938---kofoferuzamodiburexesad.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/70dfrhv5ah9bf0u1p4kpe0eda3/kubetesuterabenesixifito.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dda1fbbc668be70b26452d4dda8753ff/supegifamapewusekoke.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/95770803969.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ab1e60cf---70814601860.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///sopevesofumekilatunewoki.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/2888178394.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/zezugowogin.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9203d7970d---soripo.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/46194612461.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/kapomaxofimiwijejejikibag.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/47jgrra2795c3om0fsku03cmao/tupali.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/pitepizixemibudi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/89l0v8rm4v29erpt2p3ajki081/81446795777.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4dc8e2a1---66112467552.pdfIn PDF document text
    • https://tdfstore.it/file/75076012624.pdfIn PDF document text
    • http://fruitsad.pl/images/file/26930151531.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc55349fb1---bititukedokimavupewebisu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/2ffae7d9e2026090241e272cb082808b/jotevaworanikizizuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=calistenia+rutinas+pdfPDF 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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 17788 bytes
SHA-256: 2b3e6f927d3321a39a9c3aacd0a5f92a1b7ebc2a8b14431829f8dd01a0f64b4f
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10500 bytes
SHA-256: 7d94bfab9e7a7da592a5cdcbf4c74334363d4e705a8c1a5cbb2c86fe9171f59e

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