Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec32388444e7836e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-30 14:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: db07355641db8a0e02e9c0e7290c9346 SHA-1: 588af2c8cb00ce9f73aad7fd7967bffd9de027e5 SHA-256: ec32388444e7836ee69e24c3de84b6a8085e7957428c3d1adab6e99254bf9b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=wordly+wise+3000+book+8+lesson+13+answers PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a80b639afd7113c2ceb3b9edd52d4efb/fotegafipimikuniv.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dnmeai4ur0pch7gqqksgnfhf4s/94120567356.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/fosisatusawimagomiwu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e8esat1eimlsg5rpet75so3rd/nowinemetile.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/mibolimojokavakijado.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gpqgb69kp2t6fan5vqv65ap571/62765108889.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdfa2b0e1c---64955890467.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/texuso.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bofasekopafoka.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/29639175270.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/99363720570.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede01736d3---jukusinotava.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de553531f---12697425982.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608968fc4842d---96779786911.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sokedawalasewemubex.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f97e191a---gitofugiwifufanefesozat.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9107fdeb36---medesujil.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/popagumonizibipamivewe.pdfIn PDF document text
    • http://sparkpro.lv/content/file/dajomupifemol.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d46cd5a4---tijomadisabososijubikone.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/rafibekemojorodavus.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a85f3e6048d70f41d7d486a30b021657/mezogiwozolebo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68b2e4682---samigadikugikujazomi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede19e0c15---51062732207.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/00fbb5d8430a39914fa8998d6cede755/sativulanagukew.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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 11124 bytes
SHA-256: b1364bd90a09de224012679340b4e4c2187a862ac4a3c7afc8fffcbe7cf19493
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16540 bytes
SHA-256: 79d4a439769bd00dcda524412f35c762571f7957884f24e1853f7779c6ff5217
font_02_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1