Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80dc138e2abf5b5…

MALICIOUS

PDF

91.2 KB Created: 2021-09-13 15:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee3fbdc4109153a0dfeb243c4eda063d SHA-1: fe416c06578dfaa108dc227cff183d5b45c55a38 SHA-256: b80dc138e2abf5b53690fb0df7d1ac0915755d572b86b0c33b6da559c10d0da9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs, several of which point to compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious websites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vitalchurchesinstitute.com/files/file/35703859580.pdf In PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/soxotokupukuxawinopidaz.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/13459149216.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf7191a4f---61057384042.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/jujuwurejaledukuvaj.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/29537031692.pdfIn PDF document text
    • https://hoongnau.com/upload/files/79479667243.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8e421409---siliwopagaginameja.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/tefomusorijixeg.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/826c205290a0eb2a30f7a1e00261d0af/5781199844.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613657c17ffce---91554662408.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/finajokax.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7757dd2f3---dexolivolutu.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/gikekiroxefefe.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/lemafufapikiv.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/muvixefino.pdfIn PDF document text
    • http://ahchala.com/img/file/wevisijaduxatexodatak.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/87115242799.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109130753048522.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/pizupo.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vipapifidofefater.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff3d290f5---pagolumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+walking+dead+season+4+episode+11PDF 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_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10744 bytes
SHA-256: 7cbb156b89802b2feae3fc6e867ae544ecbc542bf22c2e2e5a27b7383bcc37fa
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 18564 bytes
SHA-256: e321eceebcf439bed008fca7eb647016ceec17032689d39e8f5f81588703467e
font_02_sfnt_off00014730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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