Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b655460a8c36db9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 13:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40362962a9ebb3c0c230a9a7d1549683 SHA-1: 3e80c596851b649603f2945aa3e32d8fa773b742 SHA-256: 2b655460a8c36db973dbb640eb3a7c6fc12176d856ae3a551c7347f0b4f64f12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or malware delivery attack pattern.

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 http://www.allatpatikapecs.hu/images/file/41350911936.pdf In PDF document text
    • http://yung-shun.com/userfiles/file/zozed.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407efe5c798---45103867579.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vekorilafedidipepufu.pdfIn PDF document text
    • http://imbirimbir.ru/files/zijalabowomuwe.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/26365958323.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147308ad92d7---3973083713.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/lezos.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613647610bccc---mufegizoxajegi.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/tunime.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/68885574914.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fe0619d7---damakegoxegetawul.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/54489758149.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5a71c503---13208944103.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/78412534589.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/82106995218.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/61660921626.pdfIn PDF document text
    • http://tzsunup.com/upload/javeratakimoxa.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vrmpoggm3c45m8bgj2hih9rhn8/46561933704.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/nuzitez.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613102174898b---sojex.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/bediviwemapefalimugir.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vulev.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/16984161106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=view+photos+on+sd+card+androidPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 18444 bytes
SHA-256: 5108cf6c5c7c08277eaef857f7aaf849d0813d6cc42fe94c69989128550a490b
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 10620 bytes
SHA-256: d4a39ee094916e546487a081ebb32c0ab3303ee2a1cedc4977922e668dd69fe1
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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