Malicious PDF — malware analysis report

Static analysis result for SHA-256 e558bb570e3f3555…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 01:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88a317bb476a0162c36921177ed8def6 SHA-1: 52dd43117f37e79ffe01277f284c3ef14d1db22a SHA-256: e558bb570e3f35556d23d773cfe33597026680a9509009e668fbc8cc1a812268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The document body is unreadable, but the heuristic findings strongly suggest a malicious intent related to URL redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44416a97b4---sexusel.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757e82c85c3---rizusegemegox.pdfIn PDF document text
    • http://kfbi.ru/content/file/kixafa.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/91531506261.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gemumumunemiwide.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5651d6243---davejovikiwagepot.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/kazasenavupozu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3cc3535bb19818aa7554d0c34665ce77/15174853894.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/6m2esh9crfftmfnm52rcejamsv/sibajaxuw.pdfIn PDF document text
    • https://tmtteks.com/files/81405059282.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/5336366893.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/36344976208fc1308a7c00cf9aa5ae5c/xugixivosomiloki.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zaberu.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/tigavobutixot.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/lapamipapavonoputirewe.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/wefibesufakufeta.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/repagotadawafunaxumurifex.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbfcb8487---rupotuvagasivizufaforazom.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16262197788499.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/rupizaxoxegibexu.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/xegosazana.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ee230933ad---63672101547.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/lurolotewatasirodisozun.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/faxevumasexolidizuxugu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/susifitatiwujolakusipalow.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7d1cb6adf872e7165a74152a4052bbae/48890793778.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/7004173130.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/94aa62bea770d93978d10e001e4475f4/nebupigavupevadarefove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=exercicios+horas+em+ingles+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 11052 bytes
SHA-256: 8de747b5803943e884a4d14f09dea4c092e35c8e92ab64ae758583158ad81b80
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 19244 bytes
SHA-256: 38352777872c4aa56909fdb566481e36c299b8a787f8a87f52738a8503ae73e0
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1