Malicious PDF — malware analysis report

Static analysis result for SHA-256 f184345ea9ac2e35…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e5a9dd325d5918492c5c091d87552eb SHA-1: ede3b81fa9cc3da0dcdcb5cd02abe26a6c7f49c7 SHA-256: f184345ea9ac2e35acbc04e9a5de79692397b74d800bbee6c6b7fb30824e8295
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to distribute malicious content. The presence of 'utm_term=pearson+grade+3+math+workbook+pdf' in one URL indicates a lure to trick users into downloading the malicious PDF. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://goldnumber.info/userfiles/file/tixojov.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/49e8b7ae13ced809a825068f49d3a86c/6898751325.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/nizawu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/687ee1bf6edab795d7592e4824f6fbe8/tinapapegedidivu.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/rokukimoxumawopavalirisut.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea6135615---lusubaji.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9713eb236---99566696950.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77609bfb5a---38623408870.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/finomosilis.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/bunifi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6v8jehor4gq6ojcf0o9v82q9k1/14504932891.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/joxizama.pdfIn PDF document text
    • https://congchung7.com/upload/file/21980880904.pdfIn PDF document text
    • https://samowar.me/userfiles/files/10450791743.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85f47101d---filatuzi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/pareburazodunegogazelos.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/62419293296.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/28719495047.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/xabew.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071952864804---fadidaxobezadalugojufoje.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/poxitedolowesaxafika.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/27561875888.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/makajetiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pearson+grade+3+math+workbook+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_off0000c395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 17368 bytes
SHA-256: 074fba87b90ea9420546eab12dbeb226c8f3ebbed787ab0e0b34d8da03035245
font_02_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 11300 bytes
SHA-256: 1f4d2e7e4f1a0d01453f7fe9dcdfaed61a0a2fdbfecc0b801e5f0c1cffe45c06

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