Malicious PDF — malware analysis report

Static analysis result for SHA-256 133aec638ee25ac2…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 02:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc968e0e7ec3484685b3a96f1fae06b2 SHA-1: b64a1e9780eb73ded971e9e9c94ac30ee293d62c SHA-256: 133aec638ee25ac27d3d98d5f7d375ad9a01f49ff11c8091173fb70cf7eb200c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as link farms or potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a content distribution scheme. No scripts were extracted, but the structure suggests a lure to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kingkady.com/uploadfile/files/54630822016.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/377334280a7f17147c0b25416d86b1ae/winudetojipigewujimuwubak.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612eef77ca335.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/81073451904.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/powinegifupekubofawas.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/45530389236.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/7566826534.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/notinopedokex.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143343c778be---fagexowelemopewilelor.pdfIn PDF document text
    • http://swhos.com/upload/files/51356122948.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613041c2896ee---waranufelozup.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44014493995.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109130651182732.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/92271028302.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d140a8cd---golobumuredefoporawusowa.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/kularazexadugevuvizewoma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435c9f4d86c---79423772071.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/bilijodonul.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/zazumibejafugisajusiji.pdfIn PDF document text
    • https://shunnasato.com/tejovixuzapuvafedum.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/viragida.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/50614917291.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/totekij.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xexifizotigogozuzojamorog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+search+volumePDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/90351730310.pdfIn PDF document text
    • 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_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 10344 bytes
SHA-256: 15f8dd4642ce2e9962d23e8dbebe64bb1aa388ada53a714e8c8fb727e7654737
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 18212 bytes
SHA-256: 219dbbe049f9cda3f114ec1f7bb40166443a5430474d70ffcbe62162e4548ad2

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