Malicious PDF — malware analysis report

Static analysis result for SHA-256 310143845f970b48…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 02:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2743e8e704bb500a8ffed537a62579e1 SHA-1: ffff6de8aa948e63366e9d1368c97053055ee185 SHA-256: 310143845f970b488f9f889769cb5a5e0d39312e22af5c192cc67a0cb45fb711
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368c411bce6---13613968319.pdf In PDF document text
    • https://o-dance.com/upload/files/pumabu.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/49630748882.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/77314062431.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/42547259595.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/11244261782.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/71773116436.pdfIn PDF document text
    • http://tochalco.com/uploads/files/mewab.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/sapafasaveselewunovakata.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/31028164423.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/tajekokovezarenavobiba.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/99625202020.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8thkr0qudfbn2ad4lv6i5ukdph/widujabofefemafovuzugo.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/dupugakilukazoradi.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/pabofezisopus.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/53284330292.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/pewodotit.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/60315570862.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/62466298253.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/gobevafaduvajigezuron.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/vanomekabenabifogi.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vilup.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/67279022781.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/bopexal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+mobile+with+tvPDF 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_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 10348 bytes
SHA-256: c5b1d012794355a6f1064f5a9d166b2d0a0b7d5ab0e0088fc5f3ac4172866d60
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 17096 bytes
SHA-256: d57776e3f679c359c4d39e22cbe7cefc6d80d345bbac8ca9266f03ea78b302ca