Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f35980b9caadb9…

MALICIOUS

PDF

90.8 KB Created: 2021-07-01 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3f43beb2723f8f89a2248335b5dc585 SHA-1: 6a97b7b558bd1e974d3fc78f1bc0163e0e9f0a04 SHA-256: 72f35980b9caadb97b9ac34f6265d5f59f6e052fc4e202198b7b3db5f5f45ed9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or scam campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly indicate malicious intent. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards the document's primary function being to redirect users to potentially malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=banking+questions+and+answers+pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac24fc35bd79288bb7a4c7d2b03e9cf5/13614335323.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/71f5b7e11ba69475d2d77a4744ade9ae/88252661519.pdf
    • http://www.mustwalge.ee/data/content/files/63498722718.pdf
    • http://augustaelectricalwork.com/editorData/file/wiroram.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa723d6d59828f963eef4f44af2d6738/75310069856.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b21fd656b8122cba868b9d72070b82eb/tetonemamapiri.pdf
    • http://diamond6ranch.com/userfiles/file/gewesowe.pdf
    • https://avigailpekelman.com/sites/default/files/file/4843253823.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/fofopigenudidamimeb.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8d1dbab9797fdf9d25fe2b01a0c0bb6f/gajinimololawonewomavine.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07358389f---zokujozasubonexukobumob.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/57557660768.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a059b98ca55---70088052142.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2a80b0a9---97571728013.pdf
    • http://coffee33.ru/archive/file/62824370555.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1174eaa00---73601895829.pdf
    • http://beastyenergy.com/userfiles/file/zeraxu.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09087947f---mutixononib.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ka35lmu0i25m6c2oq18rlep9p1/xavosajazam.pdf
    • https://careersourceokaloosawalton.com/files/public/xubijukonikonunusuwonale.pdf
    • http://divapharma.com/uploaded/file/80866565127.pdf
    • http://forter.vn/hinhanh/file/pawozusakaberivegugekor.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9cbb95080ff7850b28654e777157ad8a/16005904495.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8ebfb73a574c95dc075f5fd6c6dfa09e/88969527971.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 16792 bytes
font_01_sfnt_off0001169b.bin
3f74191456bb897f1ab215dcdcef29102a2d98215c607f450aa302af60a03c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 17288 bytes
font_02_sfnt_off000143ee.bin
3fa3a3f818f490bf954757d3c9556b0f0d380dacf9615b4ead1fa565cb432f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 11104 bytes