Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd0f0dd07b0812…

MALICIOUS

PDF

85.9 KB Created: 2021-07-29 23:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0b85de1ef7fe80287c1cf02c069c8f3 SHA-1: 30292e216191fd3c82a9857c501e61c4f808f1f3 SHA-256: aefd0f0dd07b0812f98e4c17bbc93b7bbd00f72e50a53bff57f08333389f6e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The use of compromised CMS upload directories suggests an effort to disguise the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a179150bb701bdf7b398c1fececd04cd/dokogamaz.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bbeee6ae929095a7e264d7bfb6ecf014/64097614676.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/poxapilogapuxajopupixojob.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b952d3b4fa---55574171096.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7d2cf8d43d8ef646c6ded9e4c65e6cd6/lenupakuxazutoxananepowap.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/afb5632c9951b6dc54e4cf12ccc641c7/niveto.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/45df0881a190ba313f29a922ff5f2d59/72305882041.pdf
    • http://yuanyoujie.vip/userfiles/file/sobumaxurasinotiligutu.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ae24b0f641da9e0fc978029ee411b2b2/miwivobaperen.pdf
    • http://uhy-th.com/image/upload/files/38358251403.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085277838aa7---zexebawapejilas.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c15338a78---xafezazugakitoxopi.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f22944cc---41840259461.pdf
    • https://alutat.com/data/file/96388266257.pdf
    • http://ladyqueen.it/userfiles/files/58802379560.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/funexakumopas.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/57317515645.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2962bbd955---juligesalabijipoti.pdf
    • https://ludifrance.fr/userfiles/file/64824569589.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/35292396776.pdf
    • http://casaalu.com/luutru/files/30528994084.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a79b9466---18475601962.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2251702701923968e4bfdb87a4cad2ae/53517189668.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fr9dcon14ohhipo18re3f37ual/50322576568.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=logic+games+bible+2019
    • 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_off0000ea0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16792 bytes
font_01_sfnt_off00010226.bin
d434bc5ae75919bb9910ed0bfa49569e2f6f3f94343fb425c17d5041fe31b414
pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10828 bytes
font_02_sfnt_off00011b34.bin
74bb6b377384e085ff455d1ede2d3431a601f1dabcd0a9abfaa2e953f5bea4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 17800 bytes