Malicious PDF — malware analysis report

Static analysis result for SHA-256 2292b846c587873d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 23:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d6d1aaebc7f4a94682236182775de44 SHA-1: 1b7dba359a22c3858c23036ac0e7846fb1a5bfff SHA-256: 2292b846c587873d16264a1f965b39b063828f5f7852e4a66f36d4045fd67731
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/ximokosogevofegutixuli.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139574b2b6c8---4211582321.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/50611141831.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907023819924086.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/mexajijejegimobazet.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62b50d01e---93691370458.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/kakipuvarezisilado.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/132303254695.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68a8a4473ef799e298d2327911413b88/98310495717.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/93810640672.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb7d01d3---mizewiv.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zavowefujodudidemifilosi.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/82880508653.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wanepazugixokivafuw.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/xudebojira.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/71848304555.pdfIn PDF document text
    • http://neteyes.eu/editor_up/tibawagutalipuvotob.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kuvodusidoz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5ba4531542ed22d13acc74ede883f26d/9339894671.pdfIn PDF document text
    • https://kristinanamaste.eu/files/mawidolesiriforijabituvaj.pdfIn PDF document text
    • http://vipdiler.ru/files/file/kiditesexupewu.pdfIn PDF document text
    • https://digireg.at/upload/rivan.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/pegukuwivinos.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/mogakebelogepuwekozikomas.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210910234913.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/xixawoxokonurotoleki.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/vujogiwejonofovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+applock+app+for+androidPDF 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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10756 bytes
SHA-256: a4cdf9484ee8eb7edd0b894ae1ef4e4ce40b0f83a35aeb147995668f9f6350fc
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 17348 bytes
SHA-256: f62f2018b23a230661692690454ec5e2d09f5549bb4ac455993e4a9fa83dafe5

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