Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99fe2923b1b1d9b…

MALICIOUS

PDF

134.2 KB Created: 2021-08-25 00:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0acebbb67178b0e57df691da70fbbedc SHA-1: 4e2b1721954841151c81001d4c99fe4865fa01db SHA-256: b99fe2923b1b1d9b1413c0b29ed57abb0681ce5905d8d3a17d3914c3a1a23f62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9483

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 http://mousike.it/img_ins/files/91980543483.pdf In PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbb5da5d8---42380628496.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/govinuvugutokanuli.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7e50f021---sidivokakodikukubajalix.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072df8594b93---soparazufejipij.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf2cdc459---49311709376.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5af792858---93071218298.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaaf3b6e93---jomupavedaweretila.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/62b0dd6e830e36e9f539ecb833a5222c/30672638928.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d4e90ba26a5.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/592d4b2e7008a153932039fbe1e4ba2e/rawuferumiwida.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8ec5b940---81171385607.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4b07a9bf---kotiwiborisogiz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286b09d617---kagipufogolufuniju.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7df301853792a504ed8a52c0ad6efe57/36756039449.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/rotuxiropodo.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/lunawanatijevi.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/31012227065.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1629838984.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e17936742451ccdadfc49e83ad1e5792/pasub.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/44804386862.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9fc9a611---vuzubo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/podejunenabafe.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/56663181994.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/savijonupetitowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pure+vowels+and+diphthongs+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D24 17136 bytes
SHA-256: 09b9729e481e12dfdcaa8b57467912350feaca9df246aab0c8ee0ac454890ed8
font_01_sfnt_off0001768e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1768E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E9B 5008 bytes
SHA-256: 8290ebd3a1dff6c2bba49f21e8201027c877d84644a6771f5814580a8cbcbfda
font_03_sfnt_off0001a08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A08D 32868 bytes
SHA-256: 80514f5b0c21dc7be95d4e04f4f8feb09d397e861db8c4ec51b2d138ad8c41f4
font_04_sfnt_off0001f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F05E 11032 bytes
SHA-256: ec46b97e71ea61e94c474fa29d12c6d49626fcfe8eecad5bf80c756c7c73e8aa