Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16042e7ef415638…

MALICIOUS

PDF

91.9 KB Created: 2021-08-10 04:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 54e1e6ecffa0bfe5348be8eb56524787 SHA-1: c43b2d98e4ac1ed71cc0e5f9af9a24819671cbf7 SHA-256: f16042e7ef415638cf424ba9497ab91bd7b3e735ff712a427d86ba482fd9b79f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/dinapiliwaniw.pdf In PDF document text
    • http://firesecurity.sk/userfiles/file/defikajezemujosirosot.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888a955a3bb---bilakawe.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0c2c5355bb75cb31ee0bfb2cdc3467ee/82436826059.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/t0gcsgm3vpj212eb1i8kkc425m/43617167361.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb6495d28---42976977687.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ccba5b021---34699650222.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/bofomibunemuladejigudugo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910e7f7d1f1---70128150506.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710e7d83013---katutu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a10e24ecac4790d4e60602cdf503a757/14671769824.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/xenetiwizebozivunexi.pdfIn PDF document text
    • http://benrassam.com/uploads/files/torojige.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5973ff91---xewewetudijix.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/dameluzanufakilame.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd5daa69---53825870430.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/08a88087889a5f65a8d1392b9358193d/buzusefaporotamaj.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/daraseminofe.pdfIn PDF document text
    • http://apvn.info/userfiles/file/13254388976.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93ebf0a47---61222367938.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/16960521882.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/89707619336.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wezaxamipagivi.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/17139904898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+use+the+soclean+machinePDF 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_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 17456 bytes
SHA-256: 64a2652a4a2030ee82f256493dab2fc4ccab8c5d24e531c1607f8e9c425f0f06
font_02_sfnt_off000147ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AD 10712 bytes
SHA-256: 74b4ea698e35ca89b02c15cb9d3c66f62ef8bc29c94da9d40d91a35abc1e530c