Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef8e42fdb9f62c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 02:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 362793e5ee9964fed3619c155326c34f SHA-1: 032f22a4c95e54457f61c72eaf7683000f994c91 SHA-256: 34ef8e42fdb9f62c85bab57355a687b163567e0cfac2b51cc48c79641f496f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the nature of the link farm and the presence of PDF URIs point towards an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cbf3a6688092cd9058d4539d3e157243/8057356848.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/lelupudidatiwope.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/93568ab9533edc740f16908464a6a257/bumaranezizitizesax.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/vofabazoxutal.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fc54021a4---xodorivogusunipeb.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/diruxarurijepejuxabufuxo.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210814173741.pdfIn PDF document text
    • https://5uempat.com/contents//files/37505207256.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/46350007858.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/besaroxegavo.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/vuret.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/35510203244.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/21969976141.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608238c6047a1---ridir.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/pasatoz.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/3817994722.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9489154d4214249176339f5c2b62dee1/dakadote.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/63271680164.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/494e3a922ce5f4386b5e4c6e4ecee808/47556685784.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/gitupilamotodov.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8abod3r4l38v8m4cq0rq068po6/51969292170.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fipuresonimexaxosanife.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6121d17e1c234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=injection+moulding+advantages+and+disadvantages+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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 15812 bytes
SHA-256: db8520ffb1b7d4202b20170930d849d404372190c0556a54dbcdf72845ea9f81
font_02_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 11112 bytes
SHA-256: 0970077160b72f9bd114f964df6f4b67b298e5cc75773c657dea09059f109989

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