Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e3a271b8b161c…

MALICIOUS

PDF

81.4 KB Created: 2021-07-21 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 05043b76f3d3b2bf353157a66dd22a56 SHA-1: 0701c061716b4f3f67220f140c0976c6fc6c0b52 SHA-256: 1c3e3a271b8b161cdcc281a3bab79b3a35f4d2fe6d8d89e1115d208d4212008e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://russkiivopros.com/images/FCKeditor/file/gamibigodefixi.pdf In PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bfd5a4d4c65d4a563aedb5345bf3fb2b/63962826823.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3802203ef6346e240a4177f459ce0c7c/77669781590.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608380abc93d9---40305311214.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kararomedijilun.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/vililipusariziwigevumu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7db4be6009a31e1cc287a6a2fa30ee8e/66832973989.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c6mil871n29d1ve7q0r3qeq1c5/seleselujazasefilul.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/a756d671ed742be2767879aa0a1ea3a8/54493708137.pdfIn PDF document text
    • https://irrisyst.eu/files/file/9664058153.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/o1t9otfov734o2lnaq2hkkjt77/46545234072.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5dab351de50c29e6c58fc2e49e686b37/puron.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/fedureweda.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088796149640---45861070272.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/47738005647.pdfIn PDF document text
    • https://mavibusiness.it/file/viwegegovutofuveg.pdfIn PDF document text
    • http://tfforming.ru/d/files/joxibijijijemesudag.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608703cf48e95---23017987345.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/58129888477.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/de71b2cd863c0a903e842e58ff78766c/83584266715.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zagikabaseretizikibubu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1vufld1g02v3q3hse3147245o3/90673965823.pdfIn PDF document text
    • https://hgb.se/filer/file/39628333921.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f033f51bb2---kifikikegigare.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d67b5d014---wekogalabipimeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+complete+download+free+softwarePDF 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 16952 bytes
SHA-256: 3782f7b71f315f769001a84b1cc6e98cf963e09be5611e4d9f7d1c4800965998
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10776 bytes
SHA-256: 2b35802688eae3b7a4f1809c3cb3be958cffcb16596feeb81fbcda587ddce234