Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef6bb8bcb11b8e2…

MALICIOUS

PDF

71.6 KB Created: 2021-09-05 08:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42d1f1d3d1cdc56dd84db7b3a4ed71f7 SHA-1: 24eae143b416182059d88107f325368357e53371 SHA-256: 7ef6bb8bcb11b8e2ab6c41019448dfda08b336ff6eb21d8b940af52e10b61c0c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hkbca.org/UploadFiles/file/20210828054442164.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada0ed29e3---62403202504.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cf9f1e1a98f0619e77540da7cb89d1ca/zaxudigedasuvo.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/78310605166.pdfIn PDF document text
    • http://lawweb.info/mycms/admin/userfiles/file/jekumibefovelolivowaj.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/9104172451.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/zamur.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc90327f33---rakomamu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535abd1bde---xifumazefak.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/zorapezizixadudigepiwuwuz.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/39879828797.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/72517374300.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7875514f2c96399e434a145b360420c/41137938472.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/25291944351.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a82ea01c3---rexanazafe.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/75553422461.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/24524357216.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jogosura.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1763dcc837---55483845154.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/kejoxadidedunedelopur.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609661743168d---buvebal.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9a4db8a63---29058713022.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pulega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=thrombocytopenia+in+pregnancy+pdfPDF 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_off0000b838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB838 15392 bytes
SHA-256: 2ae0a7b7be10acce2d07d6d74c4991f0bfd02f528ad9420d12b3533ca0771148
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 11068 bytes
SHA-256: 5e3a9a197f3f1e3f8bc9abf28be2e53fbe421bbca7374cd4808041650543966f

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