Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a0ddef7bd1b330…

MALICIOUS

PDF

86.7 KB Created: 2021-07-24 17:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d9dbc3bedd4d79ba72153cb66db462d SHA-1: 06469ba09b4715d3b80ef2ff381b3c9997be85e4 SHA-256: 45a0ddef7bd1b3305b6f5d901847347c3ad41792c7942383e0f22a0448fb8e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://zlato-invest.cz/upload/files/zikurenixil.pdf In PDF document text
    • http://vtaky.sk/media/file/75165324488.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/kejil.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/bujiwibido.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/36cff3b3ef17db4dbde5c191df4b050e/vajimidukag.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/29414371802.pdfIn PDF document text
    • http://strandedtattoo.net/file/gugeposelidalalokelepow.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h26hiuckvq6em9r7uiud67jgp1/siremolifarolevevuwetar.pdfIn PDF document text
    • https://maclashoes.it/file/15955679079.pdfIn PDF document text
    • https://afayl.com/userfiles/file/13899182366.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf1643699e---sategu.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/mosugilizokexumawolaf.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1580cb243---75913292976.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29382738819.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/tolipoxelidi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ec953ac5f4bbc9a0f7f09528c55f3727/65509005744.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1f25c91d---kutifinogi.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/ium7eellne7km2kg7n7bt6p7md/baxuloxukadoxu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ejefjlgq2u47f2olvgp4o7p9r3/lezolelufurumozipiwoze.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/81692759015.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/xewuna.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91726eb4c---99936551655.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85e8a0dcd---judapiwalaluguve.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1349d759f0---1074078669.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6bai02rv42cqvm8a0p47igu5ge/fogowakazilibaxusuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=como+convertir+cm+a+pulgadas+en+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 17888 bytes
SHA-256: 46390822d6880828ff17a08d39e201d3cbe37b126d9cc2638ee7db10d98de0c9
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 11156 bytes
SHA-256: 2d9e7127894ff1792263df7ee37cef85dd4c4f5b6f35ba90b8a940b592bc136e
font_03_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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