Malicious PDF — malware analysis report

Static analysis result for SHA-256 621c84fc4e26abc8…

MALICIOUS

PDF

85.9 KB Created: 2021-08-07 13:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 626c5e39d17b8c6e680e786cc72af2de SHA-1: 8e6036fc7f8c493c3f1f1304b20faf9baae112ca SHA-256: 621c84fc4e26abc81802fb659874c917c306295229a58ccce2d6eb90fb1c7c23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains multiple embedded URLs, some pointing to IP addresses and others to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dca44a3c2---fexid.pdf In PDF document text
    • http://francescofesta.it/userfiles/files/mekakegesafif.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975e5cf6d1---jaremogutikiku.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q6g7f6k7p5asek7vtdse1hnl44/bivinubisorivulonadu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ecmngp5un023dn10nutid1rhq2/14079930952.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/36718608552.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210729_215950.pdfPDF link annotation
    • http://nensi.si/upload/file/funeko.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/45896682832.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/to5ejtmeeg8h888uv7n7d5euj7/42167885467.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02707a00c---86136889125.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f486ecb0---26867118407.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/4144061435.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079534679386---xatususivupiw.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kurav.pdfIn PDF document text
    • https://istanajp2.com/contents//files/gojibuxalibiw.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93500dac6---nokul.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/sasiwewawajupe.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/486f7cdccdc18c84e111dfea00e3c629/74336523341.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd87d0524---91488522062.pdfIn PDF document text
    • https://allianztc.ro/files/file/64491623448.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/benom.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/11212952290.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hfs8k5n0p856mvmm4h79qfon0l/98938693587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=10+ejercicios+de+diferencia+de+cubosPDF 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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10772 bytes
SHA-256: b1d105edfea1f0be99801b181b2d5355ae0b45c9c03533c64d4f5653281b2ea0
font_02_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 18480 bytes
SHA-256: ea69743851ff773a288cb852ea39ec5ac866477db462106e94ef5b6e813ef647

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