Malicious PDF — malware analysis report

Static analysis result for SHA-256 03667722c49d5d78…

MALICIOUS

PDF

108.3 KB Created: 2021-06-24 22:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e808dc03ed49e03b073507a99dc8e8cb SHA-1: e330ea0b7eebb7d11f07b688c38788cb7e1c1cf2 SHA-256: 03667722c49d5d78c8f2e346df56756ca5f64585855770881f0c69cd5c69a58a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or SEO poisoning lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/uplcv?utm_term=shyamchi+aai+short+story+in+marathi+pdf PDF link annotation
    • http://fdceta02.fr/catalogue_dynamique/file/91099977914.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8014ad4da6---jitobetu.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/efd92bbcbad97632417365ce53b39462/93549981256.pdfIn PDF document text
    • https://samtee.com/admin/images/file/bomamijexuvikuga.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b9936be3---vuriwusik.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bad08c76---rusovibitekuzikovafuwode.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/91084012927.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/42136881389.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e789b786---lijogexizo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726940d6341---sodovobin.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160815e801767a---89517516431.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/pazafotanabajasaw.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/22986672505.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/37893866776.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gufafazulobelijafefebajox.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfdfb81a7---99507950306.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16091f20263075---folovukoladojoga.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vn4ag70lgm3h81cbcb451gfjl0/lesemozulokizafaxesi.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016a35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16A35 19676 bytes
SHA-256: 5831c94af615d55704b52d86a4127e91d47bcadcd93cb6315188fb7c52227ca3
font_00_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 5568 bytes
SHA-256: 365d25ce19258f7ca241ca24f2161fd8299341fc696dd6509db8752fe4018cfc
font_01_sfnt_off000139fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FE 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00014562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14562 10688 bytes
SHA-256: 7bc9bd99ac6c8cbb91aabe5904eeca90889d045af0e5ca3c528f94bd43e70ee3

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