Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33abfc37268d1f9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 13:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4fac23e72dbf0a1ad9d7bc492561a99 SHA-1: 4211a5681c6617045e869fc3972d03bb04681a10 SHA-256: c33abfc37268d1f97de1766a6577f4615fc34a20856b52030ef8b1942bd67380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various potentially compromised or malicious websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests an attempt to obscure the true malicious destination by leveraging numerous domains, some of which appear to be compromised WordPress sites.

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://jf-orvalho.pt/userfiles/file/mojiruvapa.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1b2112cc695b09c4add7cce2b88e4883/90861864160.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9e3387800cac89b2132dd66dd8b3e398/wesinimalubudovo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e18185b29---2889394581.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/mulamefude.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/68859160260.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/zereviwakexaj.pdfIn PDF document text
    • http://industrialdevices.in/uploads/polojagafibemareketebetat.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7b8ba815---15426983093.pdfIn PDF document text
    • https://taperagi.com/contents/files/sikefukefuf.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/judisamemanoves.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/lorokuruvevis.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/10350808090.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fojavilifisax.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/fosomadagatilawakebimejap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882d3ed0cb---32518770326.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/7727776820.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/16351882350.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/diwodasuxesujana.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/45609428070.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab77773ec---685157970.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///59621733120.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614359ea46930---gawiroxubami.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/xiwuzi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c70a35803---gexipipimajur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=resident+evil+4+apk+android+downloadPDF 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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 17344 bytes
SHA-256: 293e47d5eff5d799107408184a61237b11795d7b71ca5b2e3b83968d27177e34
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 10752 bytes
SHA-256: 4923e70c09587ee2776f26c3e8d7653ad5b19069c8f8b2185c7d57382e172fcd
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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