Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47a6957c2e5efb4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 00:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cf0b5942ac9d4e54131151ea14b160c SHA-1: fdefba78dc138036ed279d83c08ac7a885704699 SHA-256: a47a6957c2e5efb4c3b76916949f6fd0021bcae14db79a71fb27d20b5c76b720
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into clicking these links. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or downloader. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a14b0dbae---98087175485.pdf In PDF document text
    • http://criollo-cocoa.com/userfiles/file/88104337486.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/judazezemelumuwafakesani.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///71592777837.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c969fba6e49---nazikedemoguxomigotoxojum.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/786a46076e1ff130aa1706d43e1f433b/26062650328.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6un1hieqird5vdkj7odlac9i4n/levipuvolukis.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/komarapivawurupibetove.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/22512029232.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2415228cc9a103435165da48160e87f4/fuvexofifebegu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf7fa15a9---bivigat.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/walixelivim.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/77001917689.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160842afb7b416---7738264283.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/71773815585.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/xisowajezopesanav.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fac3887a3ee603faa0040fe5b9182979/zemubovasuk.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ad83dd86685af4c0e8ec6cf4d3b67e82/voloxomejelusub.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982031902f2---38595831401.pdfIn PDF document text
    • http://topstec.com/d/files/doxonameramewotesop.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/pamasibemerarumare.pdfIn PDF document text
    • https://strechybenesov.cz/content/41052482541.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/89690685017.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/545209_kubekogiwezipopijajujuka.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210803044207.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/19000803676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cash+basis+accounting+meaningPDF 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 17456 bytes
SHA-256: 75fa0497055b93bd371a83db1011615c5d6ab48f85c110e4531637bc2beb1fe0
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 10804 bytes
SHA-256: 1cd39fb674c34a0efaf806bc4602092c8298e96ffe92bd43d7f5f14db443c06c

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