Malicious PDF — malware analysis report

Static analysis result for SHA-256 9106c8cfd34b244c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 23:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a84f54cafb78872e8986139c8f7127b6 SHA-1: 67884c9053007f43c5efeee0a6f4c37b8aa4dafe SHA-256: 9106c8cfd34b244ce463a92bdf89721e45372de9e0b4f84432429c41483289bf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised CMS uploads and a lure for a password-protected archive. The ML classifier also strongly flagged this PDF as malicious. These findings suggest the document is designed to trick users into downloading a password-protected file, likely containing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traktorpulling.de/ablage/userfiles/files/1142129341.pdf In PDF document text
    • http://krakowska98.com/zdjecia/fck/file/jorizuzosanak.pdfIn PDF document text
    • https://digireg.com/upload/37201958205.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/80714620538.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf6d89306---jujuvitagironabejalireg.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/72829904139.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/81639784731.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/bumiwepusabobeluk.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/15685537537.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/85988798942.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908175215_675142359.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321efbb0d5f---favetufulubesamofasono.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/lusukasapisixo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/newomosewapuropubuxigasob.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/guxixapekol.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/rebetukopozalepawadijeku.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/rotazafivupoguxixiboxe.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/88826600931.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/10771759027.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/walebosazapigotenobud.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/98863638622.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/41007942596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+run+zip+files+on+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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 19640 bytes
SHA-256: 0d9c54aaae3841d185442b580abd019ee377a4938d7c0dcb543afc93f1a16193
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 10728 bytes
SHA-256: bb6ec27f7798550a3331c3cf56f7f99194d24e1ca0b548ac2708bfc814d263ca

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