Malicious PDF — malware analysis report

Static analysis result for SHA-256 750414457363196c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 21:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04de9dca438b508e081fa71ab09f54d6 SHA-1: aaa52d56efab219b990db2786c2b5fc9b23cf13d SHA-256: 750414457363196c601ae4d6748d3624163c3907eb92bc3b367051da4a731b91
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators points towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stomerijindex.nl/images/uploads/nufizaxadofujid.pdf In PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/zofisogituvimikib.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/jifibupopa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gepolopovo.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/75088109123.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/sawutatajalemexibiwekok.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/misatesaninomovom.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9433a94ff---48283895265.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/63748366109.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/69703335023.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/46493075403.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ec460ef5---nejezukuvisagu.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/97076215356.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/dufuxikibifivixefiw.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/72542309043.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i0mhf7djbjsu8draoknl8kvds0/43996753606.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/moxaz.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/6365513592.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/94953587666.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/suvazubetolotonejilemo.pdfIn PDF document text
    • http://sro52.ru/uploads/files/daxib.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141ace45b7a9---88752724856.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/kipef.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e7006f412a00287598b5d19285d59337/rajanudugexexefid.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f29ea61b3---vifefalisofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+movie+streaming+appPDF 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_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 16988 bytes
SHA-256: 9f0a11f54f5d5e122ff7c87e3ae9b98e9ca71769f667a1d81f6d59a71c4a9d12
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10776 bytes
SHA-256: dbdf5cd73015e0fecb5338d6562ad9de8ee4d04e5648f5d03544abc22ecf8f89
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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