Malicious PDF — malware analysis report

Static analysis result for SHA-256 423341bb89eefc25…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 918cb67effc768120b93f4a7cc9de3bf SHA-1: 8d5cf7b32075c00e6d20f996014c2e529ac52fef SHA-256: 423341bb89eefc25082aed13e7043bc89a00bd3c93879ae62d705493a42179b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1cfbb180aba10f5ca67cc4e0f5ef88b9/rugukudo.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/032cd4cc66f018ddc55457e9cde1dd84/84308367059.pdf
    • https://komunalno-vrgorac.hr/files/lagomatigewojozig.pdf
    • http://duancanhotot.com/upload/files/37283233370.pdf
    • http://mea-travel.pl/userfiles/file/fobulutagaperozo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e0cd7b01---kunosabejanumapuwum.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2ubi3e2lvd8u9dj3buhts2ker9/48654004145.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0461cac00---96450704723.pdf
    • https://nasroglobal.com/userfiles/file/tepuberetaxosumirawupu.pdf
    • http://stacjaregeneracja.pl/userfiles/file/25193460389.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/kugipuzebubakil.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/musiwaxonateje.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/693a521d253d585e0062551731f6322e/82176851333.pdf
    • http://poiskvod.ru/images/file/duzexeromikuta.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ffa555d7caa214359700f248181d4f02/87618454461.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9bccee0547bcce45dd16c696256609e8/12942623890.pdf
    • http://busankid.com/webfiles/board/file///32685595523.pdf
    • http://aivieksteslaivas.lv/userfiles/file/6351193115.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a817a813b33---74051837618.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/71981879476.pdf
    • http://chroscina.com/userfiles/file/31575980104.pdf
    • http://loveperfectionschool.com/upload/file/2780846648.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/31vj8g5mjlksa88bq97k8u7ch5/18244940739.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b228d47bb---96504901244.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703362d811c---54937125545.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sims+symptoms+in+the+mind+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010386.bin
341d30124492cf2513c89879810b91bc22d74f7d171980702035505ba19d3b82
pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10644 bytes
font_01_sfnt_off00011ba8.bin
9412af1f00230a0b348b0ccc9c0159e00c712a4e155473b37914d20cfc9daad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 17040 bytes
font_02_sfnt_off00014845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14845 16792 bytes