Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba0317e75fe4a00…

MALICIOUS

PDF

98.0 KB Created: 2021-08-12 19:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f3a895d93a4ce0356b35f17a3c4b2719 SHA-1: 8ddc456ecb6597771046bde7897e82f46bf4d2bb SHA-256: dba0317e75fe4a00ace96922b2b4e92474a7b5b517ecb59b5b76b25729b23d41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://okazdedziecko.pl/_files/Media/file/tujotaguk.pdf In PDF document text
    • https://tempegaring.com/contents//files/17216688680.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16108a6061558e---25703630686.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/nobavunid.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a898bd808---15439520188.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e582a5ec800911470a5a6ffa3573c17b/81674068248.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/lulebuvijuzinalilef.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/tasemopus.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/3392293561.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/03rdboav06sfvv335pm879q9vg/68356984522.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/redapuvami.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/61045692685.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/keneteguxesunede.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6026f753b804b8d227cbb9fff6a082dd/21430020176.pdfIn PDF document text
    • https://fallsplat.se/file/52547420621.pdfIn PDF document text
    • http://kelvista.lt/images/files/82438990560.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2f3db9f4b5802f593a0b22092bdd85d4/misujodopowawiginifisij.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01a6e9b701---gukinovevirigane.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/mijedamisujuvi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe4707ebc---78917268038.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b602a64bdc9---12027269054.pdfIn PDF document text
    • https://drlanda.hu/user/file/72328676277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=snark+super+tight+tuner+instructionsPDF 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_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10872 bytes
SHA-256: e4ffe238543c12a3ca0296d0d080f002c66c7e38511c73ca958173c965d28e56
font_01_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 18536 bytes
SHA-256: a77c6c084c3859a9e9a735c39f278dbffd9b3d6daeec61a0e209988aacc51402
font_02_sfnt_off00016196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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