Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1919e3c128825a…

MALICIOUS

PDF

93.6 KB Created: 2021-07-07 03:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3a6f1a1a2c923cdee6ba85bb5caa8d0c SHA-1: 37e0debe4b04b8196cb181bb7e35f8a31db909a7 SHA-256: da1919e3c128825a6eacef471c1a2bf0a1d749860ed1750db9a790018fba052d
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 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lusagroup.mobi/images/website/user/files/wuforafemisekavojek.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0784523ba7afe101cb5c69dd147c0c57/88042473841.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3517c591d2fcb914a6c41e3e2a369685/sipujiga.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/manuwoxekewako.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/36ae52e128bfcef4f25ba7adc916a67b/furezuzimupudasis.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5f3b8d9c---56346615278.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4423694368.pdfIn PDF document text
    • http://mousike.it/img_ins/files/84180874108.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160913a534345e---dawovexoxelobenimimudod.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/u0e7r8s1sfc75p6mmnnaslr974/59940561331.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/oj2k28hca1ffam0r30r5quebk1/dizokanukadezekudub.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e24b24ae9481cf44e60207373ae30207/77500384118.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/zagif.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/kufenizibejenadatifemota.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/saxarivemikepanerogopove.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc63a07cac---8853769388.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/72566800107.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jofinukajixosunuta.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be160c11---42402153647.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607322007feee---woxarufelebusikawu.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/38274330413.pdfIn PDF document text
    • http://bdn10.cz/files/file/bapugomidatejat.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/13072014871.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ff89434f---43054052191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+robux+in+pcPDF 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_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 17380 bytes
SHA-256: 00dad252f7cde7ba9c3830659eafffca3b857cc2ad5e0ebab0aa3c39d081421f
font_01_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 10212 bytes
SHA-256: 805469de5ebc22ac2140d4844d267bdb3aca0bd36f75610228460b236746e03c
font_02_sfnt_off00015174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1