Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26fcfc1a9975601…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 08:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2433f4c9ae9b3dfea3b1896c3654c46d SHA-1: 7a794dc4cb01ce1e9a4057bcb5a247eff44a5937 SHA-256: a26fcfc1a9975601a6db62b9b46490f107c20fa29ebebb6a6370058e835de736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mariellatriolo.it/public/file/27047460811.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/11942396994.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/13731311138.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8300749db---zamefipe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d70ce9f3---56802769815.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wegofibedokowanalinibofip.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/61022716103.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/zixususuzojukatoruwaneris.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210607171233.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cc0080766b1f12cefe97be83dc5a409b/52755684523.pdfIn PDF document text
    • https://amblamy.ee/upload/file/18160985072.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kijituvugeditupujog.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/dnemckal882svndnm4sh57ngmo/76979115045.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/36358000434.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0aejv8bgkbfa4r71qicc6n7uut/buguvedumovo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xogavojotomofexufam.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56b792e8e---ravejiserurematinefubed.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246e499338---51381540020.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9a5a1265cdd34258d57b5f24389d78e9/nekugumogufoxakejim.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/95464009206.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/wuxajimilekuwojosafogap.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5bb8ed496---getabaderenomimizigetufi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_061429_166.pdfIn PDF document text
    • http://health-bridge.in/upload/file/tuganatojijijolapikolen.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08cc6a1e5a---34579075705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=makkar+ielts+reading+book+2019+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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 18088 bytes
SHA-256: ae9748a361f3eb53118b356a68ccb0a2cdbab7963bb0c39d4ef54dd19873d8ea
font_01_sfnt_off000115c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 11360 bytes
SHA-256: 8a8bb00562b44e3bada8e654443298e9f74095ea71efbed9eb87d64c43f8566c
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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