Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d17acebf16184ad…

MALICIOUS

PDF

71.6 KB Created: 2021-07-07 21:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd3d21764a858c09313185570a87ac46 SHA-1: f1daf0c5d0937d4d2d5c859b11f147c0f6da21bd SHA-256: 5d17acebf16184adf0cf74b5f01b2d60019602f17f167252fb16199d67b1a116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097edbd52410---numetowaw.pdf In PDF document text
    • https://khabul.mn/mmpa/userfiles/files/xalunenumil.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4793b77e7bc96468f5f16a6e9c1bf462/gazamalagegivijuwowo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/puxek.pdfIn PDF document text
    • http://ymmicro.com/files/files/tujagaduzifozi.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/ridazurimefakexelo.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/pitudokux.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b20acc4a2c87da5ff8620b5556c794b9/mizimawakanobakekematatov.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/feduvatulupinasunemizoj.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xaxaxexexozerorigo.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/rolufumuxufu.pdfIn PDF document text
    • https://jagominum.com/contents//files/25165043449.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fcaa5a808---sekutumuvoluvowa.pdfIn PDF document text
    • http://apsons.eu/files/file/luligisutogal.pdfIn PDF document text
    • https://datajournonepal.org/files/lupizor.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f204404d3---bowapenorof.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/89848765393.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50436794a---gafuxinoxanumabuvuveri.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160859085d98da---kiresozis.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021053110103580554.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/94971804050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+put+a+password+on+your+computerPDF 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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 10828 bytes
SHA-256: a0db2af87c8e8021179e91d5b436fb986bf43895e6ab4cf6b262fbd6bf272645
font_01_sfnt_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 15868 bytes
SHA-256: 443be5fce91920a3483ec23c53a49e34e884fe311a99fa8bfb0056dc4a84e6a6
font_02_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1