Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f6632a6ae4b2f3…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 12:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f22fe3b672670f4dd2a783544757c8a6 SHA-1: 8c45f492c58d68991450a63ab6ad3ec4b44fb01b SHA-256: 33f6632a6ae4b2f36d20a9d6a9d52cf4135eec71140fea9b029a7fa1f5f1baf6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous links pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing or malware hosting sites. No scripts were extracted, and the document body was unreadable, but the presence of external URI heuristics and link farm indicators strongly suggests a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0t4fdqunhsa7nc5sapa955v7t7/26719472048.pdf In PDF document text
    • http://hzjksj.com/images/upload/File/sevukilugumolevi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/49996906549.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zakibebeditowatunefata.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8ced1bdf2f079a4bda851d5212d70b17/9481868596.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9aab64b8f5b93e05558bab8fd5a97fc8/29395144824.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc3682271---64797902426.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/361c5b5cadb8a7f23c4323b6593744df/nelisa.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/gaduva.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/50d1afba59d1ca21cc290f267fc73dc4/40610934924.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0c94624f---99238187031.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fepozawitebemukazodiwes.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0eb326c0d2206eb48f2500af05ac7307/pevuporaf.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160998593c9e39---17891598022.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/21cacd0d5881ee4a0277c77257c85e55/rakixawaduxabanakerupara.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/firojetudozufu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077914187cce---gilejo.pdfIn PDF document text
    • http://ruresept.ru/files/file/sopasokufodosetunigotudeg.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160934e2976de1---80378320025.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/bisizimetawipijaruler.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8e2bv0lcqkb0uct1dea4g26ot7/pipobafawe.pdfIn PDF document text
    • https://hiroyoung.com/data/files/59839506686.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/97109157059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+new+movie+cursed+child+release+datePDF 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_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 17536 bytes
SHA-256: fc6cf7066117909fcd8051a7883a45402b689372261df6a5a6f37680ae314aa7
font_01_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 11136 bytes
SHA-256: ae213476065c3ea93f0fc9137d7bd7034af2e1b16cb39ff899ca02d1ae379fd8
font_02_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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