Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd2b83c6fa93258…

MALICIOUS

PDF

85.8 KB Created: 2021-10-07 11:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1cd40cc8970d32182554942d89f201ce SHA-1: d43b407ee60a2fddd301bd00036cd46624459e4b SHA-256: 2cd2b83c6fa93258fb7a4acbe7276f2a4ddc4579e0afe6fd55bee64af132dfa7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The presence of urgency language suggests a phishing or social engineering attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=rrb+number+system+questions+and+answers+pdf PDF link annotation
    • https://nguoixunghekiev.vn/userfiles/file/24145211051.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/56855206267.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/16274667574.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210917050913158.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wazilozaxoborileneruvufab.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/lozeg.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/guwuwexipavoba.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/17003040951.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/843a395b6af7c09c364e00014a04f532/82524273831.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/jonel.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/goxareledamebaz.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/44967112685.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/42867571886.pdfIn PDF document text
    • http://heizler.hu/files/file/kotoxepume.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/35862744246.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/37827240573.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/8391430287.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/43747508062.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/89461209639.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7c2ddf902cc0cb83958f07daf051041e/1749698186.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/65069684160.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d53c3115d0---busodur.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/befarifigitifefivokaromir.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/65467429700.pdfIn PDF document text
    • 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_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 18200 bytes
SHA-256: ce4f8bd036817a600d342749f3149c42ead74dcaefa2e5e5502a5a637aa5f0a2
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 11244 bytes
SHA-256: 28783372d2fb1fb770ed48b6edad9d917b4d5134c0d0e97f753276e71f09b05f

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