Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfb7e8f4a7a8e8c…

MALICIOUS

PDF

84.9 KB Created: 2021-08-17 12:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bfe1257884f029ee70a4db5cdd154934 SHA-1: 67ae170c468c6cb6589c2bfafb261d487f2267a0 SHA-256: dbfb7e8f4a7a8e8c09e6ee7982aa6be91ba91672a9b24df507512627af2a230e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The primary purpose seems to be directing users to potentially malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e3086a486c98a0ce2a596d58daf81386/rutem.pdf In PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/tozev.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77619494e---7802406866.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/mebubexevurujimunato.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4f52920c4daeb8807099b763f28503b1/gogoparel.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/lobopopuwovozo.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082469673026---43301071410.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/67240669489.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b43eefd15ed---84840810603.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9801c98fc2---97596162387.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb28f240fd---44254244380.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d82cceda---26467151714.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c42d66573b7a09cb3233d70f4b5f4f09/79998070322.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/7410264597.pdfIn PDF document text
    • http://askort.pl/Upload/file/75227086091.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/70873118316.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96978278274.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xavegukijuso.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/98802448809.pdfIn PDF document text
    • https://jjpremiers.com/files/44716513579.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/5759484170.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7537440962.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/logasitudexefasujubawixo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3afac0df86f66bb7e0c8f74214b2c629/ziravitedovovagefadet.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/387e5d89613d1033f28bea3ae7f99823/45289468521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sujet+type+bac+enseignement+scientifique+2019PDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 11724 bytes
SHA-256: e6653fd26f931a4102eed622adff0b9873f7335b6ffd792f8065b20b7b929d35
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 17968 bytes
SHA-256: ee97eea392038d27462dfceeee41e68a20c79e38ddbb27b45503bd02c0a95c57