Malicious PDF — malware analysis report

Static analysis result for SHA-256 efde79c87439e159…

MALICIOUS

PDF

97.2 KB Created: 2021-06-30 02:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3611660e059a166383d47e5a1c8aec0e SHA-1: 88ba128daf9a7d08ff9d72245d8bbdd71436aa1f SHA-256: efde79c87439e159c8ac848b51091055764a3894458364570b16c2de10eebf8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to lure users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://cvconstructionsgoa.com/pharma/admin/userfiles/file/33905492073.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085afac412ea---78811858033.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f430e25d---pafemodajumozuvunu.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/93076406228.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/teliwipiguwe.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9280a84---batekevugironenuwunudisu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2978019c5beadd75dd45373279a9aa4c/vilabiziwovurumugem.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/pivepax.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8m3vtfaoqunhfq39j5i7tev2kg/37392307389.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee28f014cb---61300872371.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7fb98fbe4458884549e724cfcf821740/92393260028.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b0518d5b4ce---lupubetusevazomizatabowa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8922e0e8---11954555863.pdfIn PDF document text
    • https://aedwea.com/upload/foto/53154439034.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xigabetaviradupizazuze.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bd477958fb9fa43828ce099c08384d2b/5322156796.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/660cfd20a0a04ba8b8bb00ef4c02649d/68657196838.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742c3f66a1b---89137560817.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c982ab15b8---kotenivokageboveru.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d2ce8142---muxemol.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/377e9616beb085b3dcee70179443e30d/zitagepegoziwekevepixori.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a1b35999a2b8cfd1cc9f75b238514eb2/rosavofobiradut.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/46439413566.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/22552405850.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d2418fb3---45297246140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+shortest+psalmPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 10284 bytes
SHA-256: 4a3dbe1fc7c98ca546d1d2ab735881c7d1a2e0f6d9c58f7982a2e5f7d94f0828
font_01_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 16404 bytes
SHA-256: d9ac7c6b6a2c216ec42bcc57535bc6da5d825741c3fb2461a9f55f6cde025be7
font_02_sfnt_off00015e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.