Malicious PDF — malware analysis report

Static analysis result for SHA-256 9439dee7c2d350d2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 07:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f1fd9830f19e0cbc75cc69fd9f4e842 SHA-1: 43ac5dd2b76e0bc19e8a19fc6890f955340f3648 SHA-256: 9439dee7c2d350d250e6927d6c42e7f5f4131b2958d0eb739f22fc295e1c3ec4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. These links are likely intended to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fuoriscena.eu/file/giwenaxaxobe.pdf In PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/gawowegedufefowugum.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ee2ce2c9---48180926994.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0d52de7d410cef047584a00e4d4ae1b4/gaxakid.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xibawibulinefono.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/11957489987.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gujibu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/37306883276.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/83145168282.pdfIn PDF document text
    • http://reylab.com/userfiles/file/munejulod.pdfIn PDF document text
    • https://denimder.org/resimler/files/83198782205.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/17608289168.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4e1587cc325760b6fe55d5b6e439c6c4/jazuno.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/soluvokuzoroxubuxikof.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/petiwolodasujapil.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/mugudizezutelepodax.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/64815480881.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/jesepibavibi.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/91207273763.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/redofisipi.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kuxefuvivovetokizopawes.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/61780420672.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/52125727649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=supporting+app+for+torrdroidPDF 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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 10504 bytes
SHA-256: 0e1fe9fea3212a2128dd1c9bfc2f263a9125104ab6559470841ab59a69589c99
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 18088 bytes
SHA-256: 43d090c1a7151e5745314fb3697082b893f4924ab091c5f8641f8a1f6aa5dc82
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1