Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ea01e7a087b90…

MALICIOUS

PDF

106.4 KB Created: 2021-09-06 14:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8a6b5abd1e7290ccd1640e31d720814 SHA-1: 62e7e0b809bbd8684f9f620418fcbe0f44479f30 SHA-256: f89ea01e7a087b906a00383750c86a23d86aa65a38b42f2f178c7b36cc8b3de7
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://pixomot.ru/uplcv?utm_term=kanji+jlpt+n2+pdf PDF link annotation
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0ed647c99c7d5a866e83b91d56ee635b/kutikuvupiruxiniril.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/eb66420de848bf9852329bb629c9ccb4/77731147891.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/796093157.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/68nuopu47fgdmhd83kl4bj5uj4/jofuturejugowugidu.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/kozovekuvase.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085507d405f2---rakokunobisanixazivilogo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd962e7facb---buzakeniwuxagozupavalifub.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3220b5dc98---93950062087.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/totoxojufizoxuvitofixi.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/fazefukevifalogidezo.pdfIn PDF document text
    • http://congluc.com/upload/files/fowufenur.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/13513515433.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/44f934b22638ce11cf9c260c330000eb/8004368881.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gc29jpnivaf8768mbsijg6oe63/27610170003.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/16260439189.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210803053520_jw0wpv.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/veruvugasuzofubo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7gseinv7vdb8skofbnqoqjd5ju/17762240830.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086949b8e5c1---wesowenelagazamigi.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4bfngjgk611loukodtrrmdi5en/butitajepasumo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1d2e5270---tusavavivifizitonev.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4529bc7046b9348082defe4481e4bd0/66370734170.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/53337200517.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/97304673887.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe02393717---91111255474.pdfIn PDF document text
    • 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_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 23244 bytes
SHA-256: 908790658040a130da36a4daea3e03db20d66518f4ebc26d9633cd8d563ad87c
font_01_sfnt_off00016d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D06 10212 bytes
SHA-256: ef61d0d3f57efda5a8066e6ea3adae94de386d7392b83a878d7f7e7cd3663dc2
font_02_sfnt_off00018401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1