Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b972b6957ebdcb…

MALICIOUS

PDF

92.8 KB Created: 2021-07-05 07:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7ba43fe72e3a3d60289b7673d176725 SHA-1: 76a81cbb1dbcb3c2c92a1cd07ef9130df8b1e8ac SHA-256: b4b972b6957ebdcb077fbe6191d220d2aa993166bb48f4abb02d81705df2d0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of numerous embedded URLs and the heuristic firings related to link farms and compromised CMS uploads point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e5c6863a---1597574545.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55feee2835---femuzukub.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6f0cbbd4a67fd46cbe5f6026f4596292/99991267338.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rgffjkal0b8ab7qt4p7f1soog1/ferabekazikisinin.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef56e42aeb---32312468112.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kekumimopemokem.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gsbfi9qvfno6e6ivpb5hh6pn15/jorato.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/wedagetopirazijuwipesuv.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a015ecc0d3---jigeginezodezilaxisixebos.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q8865mkdk75bslou7v9td98ri0/panuzibulozuwabixofoxipez.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/govija.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/98746749240.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a17431e95a89f2f2ad0be3d780b2aaf6/potepilaludu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/8120773391.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/dujumerawifivipupita.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/26505752350.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f8da7242a---sevobu.pdfIn PDF document text
    • http://getem.plfiles/file/24063952959.pdfIn PDF document text
    • http://partnercable.hu/files/72530598667.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/68329981973.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1042b480---43008241686.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/76412912815.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/jojikujana.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vovemikefosabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=words+to+let+it+be+by+paul+mccartneyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 19300 bytes
SHA-256: d698fe05060495905a4f4f7076ff30343455583daefe898a97ed618ae1755dde
font_03_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C38 11020 bytes
SHA-256: 35ee996bbcaea531a9d8c328eda111e3c651aec0dbfaa524226dd03566158b19

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