Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b965479b02f53e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 06:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14a6d8dedc0ebc7e22f79f84c9f378a7 SHA-1: 0f6b49a225651d1ea6b05904130f1fc2490e459f SHA-256: b7b965479b02f53e81df000e453e16abaf2351e0857c065e795e9a24058d8b6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/830abc94369f99fd475b5435bbb263e1/52960829779.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0b4c448d6ed9011581ad5b57058bed6b/fupegomuwanetisinomepami.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b39dc9b5---zenobanebip.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1af3ifvgpda6625o6ij561evcd/pufosoxasugizap.pdfIn PDF document text
    • https://birotex.rs/images/files/40257420782.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/45548582210.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1dc0e495cd0640c3edfa9a445c81d7d5/67478717689.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160967d50d3f1c---67426516234.pdfIn PDF document text
    • http://asfalon.com/__files/file/53016871727.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/nepal.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f9cf60d7a21a5e642e444c315d9661f2/43521807933.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/serinovubizatipaxok.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/pafiwanuvatisepufe.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3eabb2c49---kisalotujutesejis.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/79e4b6a7088a2e627cc94634ac9589c9/lurujokizirijaf.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fc1ac5474---28057238154.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/sefemufajezona.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/84252557149.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/37071038697.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/46078025921.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/nebilobefewonirinuwoxosaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=westfield+insurance+business+income+worksheetPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/wunapobavemujezinebikubad.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

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_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 11152 bytes
SHA-256: 9708b9981eca0ab7298e1d684c0e3014f7f44ce363bfdc0eeeb25473321c7004
font_01_sfnt_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 16116 bytes
SHA-256: e23d4e05ce04096970e5bc064152dc43e4be06fe0ea9e4f4585a48afd6fa261e

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