Malicious PDF — malware analysis report

Static analysis result for SHA-256 055fa256309245a1…

MALICIOUS

PDF

84.5 KB Created: 2021-08-28 14:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 695f469d7bd803e431b99094ff3470d6 SHA-1: 373f9d3b4025b0882ba37587fea2efa5a590ed84 SHA-256: 055fa256309245a1f5b98da51072d81044369ee070fdcb6ed5eca4d42330ab01
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a potential phishing trojan. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress sites. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://textosolutionslinguistiques.ca/upload/editor/file/70150494671.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/pelaxipirixazolirodam.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba7470caa---gakoxajuzubukevinazowesi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pimequtn70g289rv2h1pruiih4/26222684552.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/65967234065.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8gb5t77cfoh39le2hfhepbdivr/jadubela.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107080728269890.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1hqcac686uc2150oasuf2nvc3a/viputasovenafipowumatexa.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nasojurisimitijepepobeza.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/firamesikof.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d68cb24a9e05730095388c00f9eaf072/19648199181.pdfIn PDF document text
    • http://goref.ru/files/file/jubogis.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68c4e99cc1---35630008802.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/31295235763.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/48583042960.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xumasolowokuzudojevuxifu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1e0d0c57---nulopefugojematoxo.pdfIn PDF document text
    • https://schmitz.cz/res/file/10936007889.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64dd02055---fememo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/91340997391.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/37248031705.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc9a3a597---mulilabumogodujejira.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/63522800984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=letter+p+tracing+worksheetsPDF 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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 10740 bytes
SHA-256: f4d4dc2ba91ade8cb9a6e051d68fa3dada696344321e30b4fbb1d8f4d5fdfb4d
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 18332 bytes
SHA-256: 139069f02297227581351f282ba7a71b959f55cebf901514578bfa4aab3e0afd
font_02_sfnt_off00012b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1