Malicious PDF — malware analysis report

Static analysis result for SHA-256 3978f3711c4e1c42…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 07:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7791e05f2fe9fbc59961d6332b82894 SHA-1: f8ef8f87cc996424f29a4de3a2d450a782355d0e SHA-256: 3978f3711c4e1c421a93a37be021d085fe11de8427ac8562e6aeeef50022766a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading and opening additional malicious documents. The structure suggests a link farm designed for phishing or malware distribution.

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://hanurichurch.org/ckfinder/userfiles/files/30396031841.pdf In PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/931446350827ad0fbdc4971b5e7243d1/80188548623.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/nonimovonubelux.pdfIn PDF document text
    • http://debten.net/UserFiles/File/jijusarodakomitujupax.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dbbd9e3867d28fc87f3bb06cc0bd1edb/nakixasumamiwijedejomix.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/judogozegile.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kifjc4ihod0kpefqlvl7a7aui4/roketiranuvobum.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/30607218389.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/wafajorikasegedorosumixud.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/97658116014.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/fegubub.pdfIn PDF document text
    • http://chongros.com/userData/board/file/91243517469.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/29708986174.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/finelenavufodinufogugudom.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/75658604587.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vamudemazizidenuvari.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/mufebeg.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4d7c4e1716d81e3e749d0fc5eb8e15e0/15469537490.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/knfiqeatpdjla105ullv0lq33o/xafamugapidadowari.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xolilitigude.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b1975106d4148200536e2872eb573018/38352860466.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9daeb1779---naferuwupixub.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e87b3ea4b63---57753113083.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/44208587299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=greisinger+gmh+3691+manualPDF 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_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 18424 bytes
SHA-256: 1cf3250e1383eaa5d77b8b4e087c65d5da4ce57e1e55d190be59d12a91b508f5
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 11036 bytes
SHA-256: ec6d098c560fd09d47e2ab31837425cf268c35ad967d15a5fa85adad42e3bb67
font_02_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1