Malicious PDF — malware analysis report

Static analysis result for SHA-256 031cd9f25c97192f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 10:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f9c82f71874abfa7bed44beae7578ac SHA-1: 648c494b48ef00fd4dee0d7ec7500e6c9620d756 SHA-256: 031cd9f25c97192fc5ebf0c676f17f9b92764c611b8725dcaeca59d261eceb0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec30b1bf0d---xenekozegamubuteju.pdf In PDF document text
    • http://abpaluso.com/upload/file/linifafilonikuze.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614121f5d1cda---21669134722.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/74213222499.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/sasarasazonoxage.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/badibivarusowufodutug.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da7421c2---wufoxivorumokiwa.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/53530184925.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/99218443131.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pikofemutogu.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/11332477847.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/64483044148.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/69891059224.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/muzidepuxuvetudebubizalo.pdfIn PDF document text
    • https://alev.az/userfiles/file/9937422073.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/revejinesugenokute.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131b10bb2366---8491866540.pdfIn PDF document text
    • https://moolans.com/uploads/files/xexumukad.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/868c44462bb0492809aae129c52e59f6/tewovoxubadaguwa.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/53617030148.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/68413030103.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/72983224758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+web+to+pdfPDF 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_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 17336 bytes
SHA-256: 27e22462b7285400b1383c2c4e7b9ac30c8ca9413b4b2e1da9a4065f480650f4
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 10324 bytes
SHA-256: f607b4bd5fd06ef7b48f1aa2910e04e76066326528670ad7f86df95dbd45f494