Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1b714a97ce8aaf…

MALICIOUS

PDF

78.7 KB Created: 2021-10-05 11:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a41d45b4a5e126584ba72496e556755 SHA-1: d9ecc8194db2218e8202d371be31bf0ab0e0544b SHA-256: 9a1b714a97ce8aaf36c6815adb285c14e63d18aabf9d316a19cdd8af72f0a384
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or 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 delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://onlinendttraining.net/files/8002838288.pdf In PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/58723811066.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130da2657518---sikanovitu.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/wazizetiragig.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/79505081452.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/80615750495.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/nafisoliri.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/26531297429.pdfIn PDF document text
    • https://koratspring.com/upload/file/97881168936.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/48268706109.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a8df3332---12704331682.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/kifoxegopu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/nesopuwikatuwo.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/pawumojosesaxude.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155d8f919812---61415365989.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kudalesusijovafezix.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/68696928671.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/ripawe.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tekozijusati.pdfIn PDF document text
    • https://cet.sk/res/file/butugamaf.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/57132134280.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/80660985547.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/48964332714.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tojukopesid.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/48187729401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=an+post+trackingPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/38448897781.pdfIn PDF document text
    • 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_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 17524 bytes
SHA-256: e100989064c70e21b156af7b6ec7e9bc98ae5f2ee8332e4389e17d9a201f5e67
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 10444 bytes
SHA-256: 39db685b0e726f676a2ec3a487513ba24eb7d441a89be25e2a3636f73c72b340