Malicious PDF — malware analysis report

Static analysis result for SHA-256 506ec7de32a33c21…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 12:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05b85a08119ffe27ea72541a92a9cab1 SHA-1: 38a6eb9e0dd5d2d2d989d7fd1f0e781e45eeaedc SHA-256: 506ec7de32a33c2164c8a7e0b7cc5ca45425ea85d4e31e9ba192798ce3532be8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e2c6583---putavulozibaxi.pdf In PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/43436818102.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/64430104646.pdfIn PDF document text
    • http://orlickachata.cz/files/files/jeluzagugikewurela.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b10c41755---kidijafutomerolubozow.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jamotuwikugajure.pdfIn PDF document text
    • http://lj-group.cn/upload/files/rosipiwojiseno.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/86106353804.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/40049601692.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/60195669193.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/fomazoweluwokewidusafeto.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/86320198497.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210903215504.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210903050739_630zby.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/17815005198.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/90219686439.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/89742803219.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/medoxafesijade.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d26600a2---tagegilizolafejemidaw.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/10055056256.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/gixezikubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=final+fantasy+apkPDF 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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17456 bytes
SHA-256: f00111b5b1880b00a760b144081c359adfeb4579cf56bc9fa32c081d50d7014d
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 10180 bytes
SHA-256: 3b1acdca7098c8f0c2e78f4d2de4eae4277a79083e4e55dc0219a7580e01ba69