Malicious PDF — malware analysis report

Static analysis result for SHA-256 afccb46f4a414cb6…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 03:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c910e28e0ab1018b55d511e4127a46db SHA-1: 452dd9551fbeca3063da6a25f3fc9d5e33b1bf7e SHA-256: afccb46f4a414cb64a3e0493b3c9b6163a31680ec722585ad79233fb7aba0634
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, 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 presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to evade detection and reach a wider audience.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://chanakyaaerospacedefence.com/userfiles/file/detajizog.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//33991699205.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n18q8n9lbpki37eb5cehgibdgg/rebapoweloji.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872df587eb3---vozanojov.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609420eca590d---jufuvuporuw.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/668491dca26e31c4b2de58164b72b96e/20376962653.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vsj2fqnbm8v1ildmmv25plub3k/genabajogisuxuvilel.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ed0d98bd---88248416747.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0385efc37---87947668406.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abbdc13f02c---dobudilojafilidir.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/sozomukefinawo.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/34147636118.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4bd279bbb2d2f8e092a14e250b6e33a2/59373086013.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff3df2893---32350465213.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815ef5745e1---31382937595.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/mr5llisvjoutifdegnipjd5h2c/kefoduxoga.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/57947425981.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160943931a746e---18608832955.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/vulozaruguvipal.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/37409813642.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c91e26724---98647680802.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iv0ghrj3roc6ukldh7v8h00b5/badedomaluzexumuja.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a2903938bbce44e5fb21bdcab5e75016/puwuxevinek.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2107c16e72bb69392be7e44ea4e91c19/80517948610.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/pinejakozupavevoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+croods+a+new+age+full+movie+123moviesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16708 bytes
SHA-256: 05ddb9db81e5b50c0eac80dab47928e9aa305e2b041324dc39968c4e3c0e5e84
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 11384 bytes
SHA-256: 7f48fe00391ce086b42a569cf7bbaa896d86f36c6025938170a2b986bc4805fa
font_03_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 17964 bytes
SHA-256: 7077cff765141a2f0426828e6307b20afd41302557b921fef25b7b815e586720