Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ae0435883b1a52…

MALICIOUS

PDF

87.3 KB Created: 2021-07-23 05:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68b744c281f19454751738f5d798dcf3 SHA-1: d19fedf2cbb187fb15c7b658c43c5fb445a43fc1 SHA-256: 14ae0435883b1a5245d5b6826987efdc8196b198da3731b3c0fec6eab4fd3eb5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://inlygiaylynhua.com/upload/files/wafipunexi.pdf In PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/65012573400.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a62a2c21---73824870551.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/77269250309.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9e3a52cc46a4704630266bd82cd6b774/18366304561.pdfIn PDF document text
    • http://rafaelokazakov.com/file/pugijapelafuzi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24913015076.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/rodukofawitube.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vipoz.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/mexaduvobimowevar.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/72761110656.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160738626bee50---17153583223.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/datogowanuwamidolanew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f772364c3c038e268e1e7e8d8691f84b/65695002860.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf339dc5dd2---36174644381.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e49bf841---80760240691.pdfIn PDF document text
    • http://thechoose.it/file/59164649377.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9db4defdc2---86631414561.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/48303452775.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xidosukela.pdfIn PDF document text
    • https://patc.fr/imagesfile/50903441490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=psychological+problems+of+old+age+pdfPDF link annotation
    • https://medlineplus.gov/olderadultmentalhealth.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://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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 16964 bytes
SHA-256: 5d35e36e38909ec922ef395e9572abbb2a2939f9d05e403d913032e3f8fad6ac
font_01_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 11120 bytes
SHA-256: 539145ed67f7a2bba5d91618418560ef3da05e1b6e72442180966b286d6a123f

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