Malicious PDF — malware analysis report

Static analysis result for SHA-256 91465cf733f41616…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 00:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6cb8592054a8cbf4a9034334a599f7a SHA-1: 1a1c596b333fa45f5d430055fcafaeaf10c2cc88 SHA-256: 91465cf733f41616a96152605da9d1dfc34f3f240dfa5787110535b531b2c462
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 compromised CMS upload directories or disposable hosting domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers flagged this PDF as malicious, with the ML model outputting a high probability of maliciousness. The presence of multiple unknown URLs suggests a phishing or SEO manipulation attempt.

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 https://ewastexperts.com/userfiles/files/60228635820.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/noxodomijidenipudesuvok.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891beacc92e---pejuwuvonijolibisitake.pdfIn PDF document text
    • https://xistenze.com/files/files/regufa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e397183fa---wenag.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/266889721610b8922931a5.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jaxegitifer.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/goroburakimuvezogumileje.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/487135924.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/sukimabofeponamu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ovhuibr23nogcgk3js5s9gdrcr/temikivexesedok.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611cace605d03---89920507516.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f2b867e1a97758d51510ceff3dd22a66/vujuxifapetewozozuvu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/du8ms18s7mbh77a1mpdsbesrn1/natizofixaliwi.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/jikefanakejisupojewuwi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad867759e9---lodolidaduvo.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60df562aea501.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/pigadurixotimurezo.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72362241268.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/89562795570.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/3362918603.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vgf9j4gdhmt7c0b04eqf5jkmh5/79650380288.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e87f3de2c71fc96e553dd0ce9d2d7cc2/xedaguzenewoxo.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/dazapinotokegujuxebaliger.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf3987a35---35416738465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=analysis+the+road+not+taken+by+robert+frostPDF 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10780 bytes
SHA-256: 593881214ada2ef4ca47c0d7f1a1031aae9e4434aaac75c268e817010a20c4a0
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 17548 bytes
SHA-256: 4524343f05a197fa3d057d1fc18a5c2996318e9b62b8dcc224dcbbdaa0fc6c46
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1