Malicious PDF — malware analysis report

Static analysis result for SHA-256 d918a95dfbb23428…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 03:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3fb5e8376d61e78f96b8585ce3694bad SHA-1: e17805e6404137cf1b9e5f5c9507c16bd25b474c SHA-256: d918a95dfbb2342866f3b5c7009510f72cbd70b27e1e28fbeda308a31d97858f
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 ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://cuakeobinhduong.com/upload/files/52587949714.pdf In PDF document text
    • https://rumusjitu.com/contents/files/lesodefesusute.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/87041758852.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f53527e0b5a8e5d9d33bd05643e579e2/kawexejupametukawopoluvix.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/93370110366.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/19609202383.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/65242163703.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/lupunodojimedorexofak.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8db1afe42---41491794844.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/jogagusutorevevoxetokanan.pdfIn PDF document text
    • http://thecuriosityshot.com/tuzavegazirugorefudanunub.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/tuwadilenotozomarul.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/5441356011.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dde595620c2e9981e090036ac20dd335/dinujujo.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/siziluvegupazejoxifinub.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/zulerenilogisaseberegar.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/65615646941.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/faxozu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/63577925498.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/sasupa.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/repelaben.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelodibevupakoxoju.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/35479760143.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/wogixakixuxobulukawufave.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0824b6100---davex.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/rofafawizogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=crud+operations+in+android+studio+using+sqlitePDF 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_off0000b9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 10844 bytes
SHA-256: 06c232296d09f9c7c84f9ab57495a9a6971dd6fe4a72d2cdfd36df07a6566075
font_02_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 15600 bytes
SHA-256: a1217e64385665437fadc87052d61c66b2d144c3f45a05a3acabfe63c63143a4

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