Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf560e96b87af26…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 12:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c38d0c30615d4ec6029dc3107ebf0652 SHA-1: 0aad9042173d8f1ac109961e1a4b74436f061a02 SHA-256: bcf560e96b87af2632a0e9a144b49ec3bd628ce442d278f955ffb16d53507a4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms on potentially compromised CMS uploads points towards an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://venefoil.com/ckfinder/userfiles/files/23804816074.pdf In PDF document text
    • https://aiaciran.org/cache/fck_files/file/konafukatufiselaxufo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ef71adb1---30422279978.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132377e38fda---sozobitudopabugojus.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dsgd7pv83o7j1aqblot2e52qsi/junitakigopa.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/xorajuxegipujusewagusuwad.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/43241732461.pdfIn PDF document text
    • https://anjingliar.com/contents/files/titonid.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/13056110607.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/39534413068.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/11495425920.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/3785626496.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/48386983646.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c6daddc8---kusabenagonilulokad.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/36921673755.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/22480206840.pdfIn PDF document text
    • http://pneusmarene.it/images/file/zexobuputi.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/82049543778.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/77865214921.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/jojepunuseme.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fimixoxefaronuxiwenifoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+i+met+your+mother+season+6+123moviesPDF 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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 11196 bytes
SHA-256: 498b05150802cc578f3d8ef9dd20afaf72fdb437f7a8c2dac7c8964c5c25d4c1
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 18940 bytes
SHA-256: 333a90763de881d113f05c1f4b31b08abf0214111e3740de2c74f9a23913640c
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1