Malicious PDF — malware analysis report

Static analysis result for SHA-256 7272034a9db17f73…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 23:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66db0387927bc0ad2a57e3fd30517106 SHA-1: 87b1a16e3f2749ae1b08e57260d97c973037f31e SHA-256: 7272034a9db17f7376392de4d791c3aea7f73a579ff125526f652619ed82173c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://doucetplasticsurgery.com/ckfinder/userfiles/files/samuv.pdf In PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/ponukalinelonudujutexojo.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901113108315.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/16903924425.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/74425125216.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ece755b19890f544c99ab76ae580653/jutenumejisakuzopevizumu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1c1dd4ohbdmm49u0cc6c6hcpk0/4847145103.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/19d9ae4ed94c59c646a0910d6bac233c/62032928803.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/958174578.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d57df028b---netixoti.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca1b14851---1791390818.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/nudajisepuwidojozowun.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/1960679462.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432b660d1a---dajeruzebufi.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pidiwazojuzimobarinuso.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cf10f90925856bfbc625509984e5c79b/gexisigafododoxig.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c936e39178---rewijurono.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/fotoregogupuner.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd5af0ea9---popinerofeguwumilafuna.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/sobejalirepoziwimewogan.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/71008665286.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/voruke.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055053946f---1694836696.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/43627212603.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xakedugelexojixeleza.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4440f1a6---wivagazuwipetuvemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=korean+hangul+practice+pdfPDF 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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 19004 bytes
SHA-256: 6a5730f1b6088451a69ce557875c5b4611c8624cc8911668cab116d6a5f1bebd
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 10824 bytes
SHA-256: 3f1661cca59572f40f9df2df8b9b1d58955e1f48322686a37c973e6d0bfaf3ad