Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad2426abd453d41…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 11:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02b8cfa70d5a6d9ddf7a0033b664c752 SHA-1: d625ef6d71e2f31276c69b5d25de4a78b87a786a SHA-256: 7ad2426abd453d41117cde8ecb8dea78abfd44fbb765acca4af961c61518e269
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://go-pxl.com/uploads/files/46564108464.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/powivosesunajujodelexe.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d641d049d---19829248544.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc77755a95---52464267231.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/vodekorigaju.pdfIn PDF document text
    • https://unitjaya.com/contents//files/85680729232.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/re89p5d36o8usr1187g7n8nvm7/teserogizosagofavaje.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d999caa9078---39716230955.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/8571dffaea17f891a2beda69af1b9571/rederipeponujoforazim.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sokuzoza.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/971ffe65307ac4cf0382594963560920/dulasimutibezesubofifexe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073640111534---mekitebipanubujofanepe.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wojifeni.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/43013685685.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/44695629065.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160e129fc269a7---komifuxip.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e01400d1dc74601bca91ae46482ae8c2/vomigisojavutot.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/93548666900.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/55590929845.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/89711442615.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/93c9713e4e14721dcf30bb9d0e10b455/10907177024.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/pamojegizewibakag.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf10f7a354---nasulimimolikomag.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9982e65e---30344907077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fractals+chaos+power+laws+minutes+from+an+infinite+paradise+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 23796 bytes
SHA-256: 53a0255c94309d4ed1ea5f5bd7fccedbaa496a0a92e9455ef99de27bc88ea83d
font_01_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 16164 bytes
SHA-256: 7fea18684db9c006ea45d7937dd37ee1718786702b7efabdf3570921f0fc13b5
font_03_sfnt_off0001508f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508F 11048 bytes
SHA-256: d4ef9e0c1c71dc316c8a83500f1432356684a65c26f4d51fc85dcbad47546b56