Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae44639daad168e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 09:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c2e94792add81bfea5fa6a36434d6d7 SHA-1: 66f672eec442ad2a96725a40b40fdd5a023d7f7d SHA-256: aae44639daad168e227c05cc08ab7919a1ecace6a2a5dbf5fd66d5d4d4ad05e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the PDF acts as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://capableapp.com/uploads/files/6419894256.pdf In PDF document text
    • http://belloverde.net/emailer/file/58189648832.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/03eaa545fbac6b6eb3ef177d626f66b9/kawifebipovine.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/21071212259.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80600ce4e6---mafib.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/72623674478.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8e8352ada56cbcbc8f93e40515e5ee5e/22813384889.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb022b417df---80419939993.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098480f54c79---138066546.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/selosonikexigovakiluwif.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109d38dbef7b---55503617611.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/92785157300.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/00bab0f3acaf408275c5d6bef7d82cc1/24919166932.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fe82a8a925d5427f6d1d700aa8cb609e/90868978023.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/gasiwabenazawe.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/93200486742.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d405e3e82---69747210372.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/aec4f7d13b3a1b0104ad0d721e01118b/41663684864.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/apgp5ljaknn8k4akl8mte0koca/bifap.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2e2530b282b407e4c8a830e58f128d60/tafebalixogudobagoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=twist+drill+geometry+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_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 10736 bytes
SHA-256: daea7bdd5c317f3d8fc94a4926ee883b97cdce0bfd8be7b5bc3b25456987b1c1
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 19104 bytes
SHA-256: fdc40e4cb8fe4129ef60a104be3b1f0efadeffa23a609a590e710625751b472a

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