Malicious PDF — malware analysis report

Static analysis result for SHA-256 881e89cf65c669e0…

MALICIOUS

PDF

81.2 KB Created: 2021-07-17 13:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7657a523a426fd2f4ae1556827f51a69 SHA-1: 06416e49ad7d225e45992ca13dc575a617c5175b SHA-256: 881e89cf65c669e052e8b35b271c279fd5ce75baa6c2cebc8d47f8b8ce8aa821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ajtoablakcentrum.com/_user/file/pumebuwazodewimeg.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3aad8e1ee---xoluvotivelezaje.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/98r5mpmvkmmnc7dnlnr58hgl93/wawekegi.pdf
    • http://tortsurprise.ru/upload/redactor/files/dilexadakibutetifur.pdf
    • http://passaicvalleyclassof1957.com/clients/44362/File/4269017505.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/26096344652.pdf
    • http://sosnovgeo.ru/userfiles/file/zenimadarixipozojep.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e7a9114e---65010365183.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4jgfjdu6dl35a2d9t4lvnjao86/bunedo.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/39966149129.pdf
    • https://trvstore.com/userfiles/file/pavum.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3fd71613---ditivajupubarodajolasi.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/56142152237.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7d5063ed---revojob.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/67157669049.pdf
    • https://menu2uplus.com/images/file/16720124173.pdf
    • https://mimpiindah2.com/contents//files/82865537779.pdf
    • http://dinskayarealty.ru/media/file/dimulofe.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204d046734---30008001529.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/78392565890.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafb409ac0a---rokezejikowuvavaxifex.pdf
    • http://rspon.pl/images/wyswig_images/file/zuperuvagepajegalif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bseb+12th+objective+question+answer+2020
    • 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_off0000d3a8.bin
7004db2007d33ddfb0a6022291cd32605a0b1f22908a902eba1dc1eed0f9e0ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 11296 bytes
font_01_sfnt_off0000ee59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16792 bytes
font_02_sfnt_off0001066b.bin
7f29b4f3a0baf3415a9873a1d48ce50a6167cf2156a5086e272b0944a393b4d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 18592 bytes