Malicious PDF — malware analysis report

Static analysis result for SHA-256 843cdd4ae34fd5c5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 18:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 153796c5a4852627499224127aa5b507 SHA-1: 7a8f22c5b3949eacbffb5d65e3a16fe55a4e7006 SHA-256: 843cdd4ae34fd5c500d55b10c7baa2f1eaa98114a9c996c5c406e995c398540a
164 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e35ca426e85ea2980b3374fa8a3df07a/83302725077.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbcecd63b---pafatomakasujujovetivuk.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/vuzewikibemadorujiwepirob.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/rlhk6ueofr752oqopfrdgvo2qe/43831339383.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/82tg09vsopv7s0m6thmj46lb06/78477431826.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/50434898515.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/468270bf0728924e74d5851540296b59/pasodeluvejeputitosuruv.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd298014ef---wukumukaxovowemag.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/86019876916.pdfIn PDF document text
    • https://mimpidia.com/contents//files/xekewoxupewena.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ee75bf039---binugobubavezixovelafiba.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6eae5283264a0322ddd17192575e8c7e/79839352270.pdfIn PDF document text
    • http://podushka.by/files/files/41266340565.pdfIn PDF document text
    • http://unsersohn.ch/images/file/soxiwijisipo.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/52699781433.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5e56fe725384232ea405f1de7e8128d8/mipagawobijatipuloge.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/85228713045.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/vopafigimajexekapawujura.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82c1518b6---pisuxuka.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d043003e23---38311304672.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ad2e72f627e3c4e660269f9365c1c62/punut.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ld7bltsa34nb9e4p5o8k7cb782/zamakijobivajow.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mhqeptg2etvc36hqlvrlf5kcjs/nixokunuzivatumixagud.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/vonifobazavigobuga.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3d0b425cc---tuxozifutunojozit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=honda+civic+2014+lxs+manual+ficha+tecnicaPDF 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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 20288 bytes
SHA-256: 7feb1e41db81e927097dde18b5dba025d64996d9974b45590ec76c914632fc5b
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 11272 bytes
SHA-256: acbb99dea6ae78fa29be7ad956b38af25a01738e7cbf2f1ae8c08121ac008281
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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