Malicious PDF — malware analysis report

Static analysis result for SHA-256 9768cdb34a94f16e…

MALICIOUS

PDF

95.2 KB Created: 2021-09-05 18:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39cf3f1d7e6a14174e01e614e801a169 SHA-1: f37acff820f00693dbceb5c8ec4476d19604dd13 SHA-256: 9768cdb34a94f16e2d97b4b2b0c5964a8e51877c4290aa295ead04a0e476087c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The presence of multiple external URIs and links to compromised CMS uploads strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=cbt+worksheets+for+obsessive+thoughts PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c339871003443cd0128b7eae395e49e3/37069091283.pdfIn PDF document text
    • https://kopari.hu/files/file/14044242023.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/wodom.pdfIn PDF document text
    • http://netflor.pl/upload/File/luwipevafewex.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/56274210000.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a9a3dd1c2beabf7539079a341c325244/tawajemumeku.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8990a8aa08---99454730402.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161005a692af74---12973776037.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/dojul.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xixavafitokisuwez.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/17418760567.pdfIn PDF document text
    • https://12shio1.com/contents//files/253779649.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vetokowiwamubidifibaw.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/27204145273.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/34084833953.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8725d05602c58d91d9661fd8954f28b6/40259093207.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ddb3m1apdj7bbsp9eb678ifvj0/rimamesinukixeg.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/jilufiritiwe.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/32149921164.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/11431584064.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2501c78e3---86734825646.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_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 19124 bytes
SHA-256: cb4d57969ed27a44799ca19c2aef597bfc77dc57e8d92db26edc898c1c839bc5
font_02_sfnt_off000156f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F1 10696 bytes
SHA-256: fb613f4d54feecd12d62e16251619f731a7f5436971f202f0861c4ebeab8029d