Malicious PDF — malware analysis report

Static analysis result for SHA-256 5912a254e55c6a75…

MALICIOUS

PDF

81.6 KB Created: 2021-06-25 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3071e5cc82be0b9b8aa8306a45b0a655 SHA-1: 7d3a80183946e950d524f5c1ce324055fe7b671f SHA-256: 5912a254e55c6a75cc293acdc07be7c3709def52bd708a04c4b848fa09f07647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crysiq.ru/uplcv?utm_term=come+on+in+korean PDF link annotation
    • http://vetcarefoundation.org/userfiles/file/xoperebixa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7094c4219852612191dfcf31f9be601c/99473243469.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/qsi8klaqg5rntbjhf1k9i5tmtg/rimafavuv.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67abebe50---77488512336.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/89878375858.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u93c8aupud6gmg5c1rab65c25q/rusoruginirisibew.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/332206c8d4fcf4f7c191078292ce0532/38135110002.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b177ca63---16748967584.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/47118448318.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/94881689105.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a42f8e0bd40699aa1ab5c64c93cabaa4/15473667420.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa663ce5afb---83312555188.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084596373294---sevimexitamofupig.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b257494e9a6a485abad22a8e1003a94/84903123679.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/8185372948.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/40930234718.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609984ebbf678.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/mekeserazipiwewojive.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/10284624269.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c1da9ae91ebebb41679f5ffc0764c1b9/vutimelojijopebilub.pdfIn PDF document text
    • https://educhina.mn/editor/files/93615409872.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/nizufisafewajinimagoje.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/pedoxawopa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/85370375596.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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10080 bytes
SHA-256: 84c039fce245f20ea85c7ba0652d3412529272c0ffadc244aa0ac706cadb4d3e
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 16824 bytes
SHA-256: bbaea80ebf9ff278d169da98c1865d0100028af1f621548d69d33457c173f9a0
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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