Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f51ee551a3c50a…

MALICIOUS

PDF

82.4 KB Created: 2021-07-05 23:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 169579ee11f47bf8ee893717e10261d2 SHA-1: 484c4cab207051f5c5460b1b2a2cf368388ee02d SHA-256: b9f51ee551a3c50a121eee1f230c9727fd559717392d52d876661b0f5940210f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive users into taking an action, likely related to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://synerhu.ru/uplcv?utm_term=accrual+and+deferral+examples PDF link annotation
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rj0q7fu93epaetp5kok908ftbu/fegofokigofaposowulevi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/a7c92fac04a5d5573ee8abca7249b718/15761642282.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5fjoo94r3eodmleg0mc6e8csrd/vepumijavivova.pdfIn PDF document text
    • http://bienbao.org/uploads/files/43515653897.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc672ff64---23797855699.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/12956963940.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a650c755844---fujos.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/noxotupozunekijum.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wikelo.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/wukagenepovegedi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c187dabd8ed---97230109434.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab26183b67---tilivobobekipezalex.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/65s4mdol962u3dq489u8eig49g/50015755025.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dajafoteromeveragefunot.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/39716913838.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/sedalenase.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/5db0d8abd3bb8fb01d97fbd8c7e6c314/36483165749.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/tejinikoparujijofo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/2969284955.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3f69ca5344ffc04b40caca7846e932d1/43931343034.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160707b7953bda---74045081592.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083685d09e92---fuluwogupizasula.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2361661bef6aced7c6f31d32670c121c/rufav.pdfIn 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 10656 bytes
SHA-256: a7fff9e433856f5ccd8d15d7b205804de866ca8cdba953e81e4fb8e81df4f1bd
font_02_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 16796 bytes
SHA-256: 301a8265d018af6a77d3e366b54e7dc1290ab84e54afb5f60cf87852c922f5ed

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