Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eee104d15b34c84…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be80271f0109b340a8b787bf134f498e SHA-1: 90a5f814a011ee5137a2582e8645c4214a44b875 SHA-256: 7eee104d15b34c84322a31e2274d48e8c71366389a0d3a5dba818fc6612484e3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=manual+ikea+malm+bed PDF link annotation
    • https://ostrichtours.com/ckfinder/userfiles/files/76693343477.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5234f10ce---71458428193.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pafesev.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/531ca145a7d763e841e0afe8d404481f/35022353146.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b9a891d802fe41687cfc1f834cdc582a/44034541201.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/455ea6deba008e199c3d42295965b9bf/96449541140.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-31/20210731101405638552.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/balobasexitexejoguj.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/kogito.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe4f7a668---16667790477.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c32b6244---welemamogeluvezizunefad.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/17612302907.pdfIn PDF document text
    • http://eternaseguros.net/files/files/laramagisuxivujunoso.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/f1o6foj39ktv76ku6e7p00m6b4/52202452687.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f4895bc9---67429511785.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/39917326058.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c33bd5d6---45329962179.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/74374064797.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16128f2f2b2926---muwagiw.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/12798210311.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/lusazamupuluda.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/19807943680.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/zegora.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f1a71dc4---tojopijepowe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725a7ce331---36338617798.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/jokawazevofurozeja.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097691a361---35693325371.pdfIn PDF document text
    • http://cartopack.be/Images/file/raziwowilisidozenovisop.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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 17588 bytes
SHA-256: 0d14c5f2e00338af2e22367847f31db37b06ad9de1519c4c98b4920b5af01697
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10248 bytes
SHA-256: 85eec910d0b0ed8d9382fda07d14b645c4004fe60a005ffeab37a004cad96519
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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