Malicious PDF — malware analysis report

Static analysis result for SHA-256 c540859e2e41ec24…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 17:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca3ad5958aea3db6f96b54c4cd98c449 SHA-1: 61b549b90ec7fec5bbc83a2d1e8c3b52d760b207 SHA-256: c540859e2e41ec241dfea335aa8b16190d2741def18a811469884b184aef6d7d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2c4d05---bozomisakemagojeb.pdf In PDF document text
    • http://senseoftourism.dk/userfiles/file/57204823257.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091318324990.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/jufovive.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/45121625062.pdfIn PDF document text
    • http://indexone.ru/upload/file/53587642037.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/labutojajazufaxazob.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/savixexer.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/xividadikadizaraguvox.pdfIn PDF document text
    • https://kawanmto.org/contents/files/31275321504.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/42637224147.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/gurikuf.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/21214731905.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/70311769384.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/98997727611.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/74216056455.pdfIn PDF document text
    • http://kasand.com/userfiles/tuzivujorigekaxepinizu.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/fibikamowotivowodup.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051355481450.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/sozewef.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b486c6fc4a3872052b4d5cdeb52c2c23/sejudovizajizupin.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/24826511848.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131081adead9---mirajozeluwizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=can+i+copy+apps+from+one+android+phone+to+anotherPDF 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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10984 bytes
SHA-256: 8705e30ed74e84b7ab6164149f5e3aa94a049901cb9bfc4249f3bfc0477ecf6b
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 17844 bytes
SHA-256: 6064485edc5debe473af6dab6c07dcb57925dfd4e58a899a790713ea421cbe06
font_02_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1