Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fc1bab93d3fbd3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 01:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5969f04a87ce929c1eb65baaab37d96 SHA-1: e73e5d896cee5c51a9c6117f8be8192469393600 SHA-256: d5fc1bab93d3fbd3ee834d1012d0e5cdd46c5023098dbf3d6e46beb60086e185
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://dragonera.cn/admin/userfiles/file/bapebufafadobawazu.pdf In PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/92790065127.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7c752eac943f1ff6d0530ed842e1b82f/87586299436.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kinilazelakumi.pdfIn PDF document text
    • https://stvorki.ru/files/file/67027287088.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/jefivupi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d82ead91---jezatepapajudazuw.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/70659373872.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a775b4c1---38950216798.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/48756820409.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/bukibakugokajajisugajim.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d088306d07---33732549178.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/levevaviroxo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/35739996345.pdfIn PDF document text
    • http://abnicum.com/files/file/raviwulorijuvapelo.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/87988301394.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a5d5ccdbe42693e0f8d7118809a1b505/25879674525.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/novabebogadagetalilegiki.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/mafotopemidututuk.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/palafomex.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/bujowowabak.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/8332817833.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/lomutura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=large+minecraft+build+ideasPDF 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_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 10896 bytes
SHA-256: 119bfceeceddad2819c98ff0e2814004ae2a0c013c1e77d55ab0c13cb98ba001
font_02_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 17384 bytes
SHA-256: fcb145c8ec38c23f306255093e30f510ae10a69eb16d753bee1a80e5acee0eb7