Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d92b3752edc26ba…

MALICIOUS

PDF

99.2 KB Created: 2021-09-20 00:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90d877c473da6561276082a1fb806b33 SHA-1: 472e8c2e276e77e9d29165db181381111deb134d SHA-256: 8d92b3752edc26ba3faa423c6699e4f6b82c10388e54b14e4db39c046b3f03aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. No scripts were extracted, but the presence of external links and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://usssecuritate.ro/userfiles/file/xekebo.pdf In PDF document text
    • https://tipresentoio.it/images/file/16029188788.pdfIn PDF document text
    • https://invision.buzyhub.com/files/jitefisewamavifunevano.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/37380332132.pdfIn PDF document text
    • http://ccadl.com/files/20210905061601.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/pimupumeg.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/lizelisi.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/38064350954.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602868b09d---moripupomitimevekilurer.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/156a276688c657838b91c6175cb750c7/46389220480.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wuvapoxijemo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614668b54d3bb---64342788254.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/70153065022.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/23581553926.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161323ae480387---koremalew.pdfIn PDF document text
    • http://darec.sk/files/files/bizevezidaverafok.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f20957ec0---90804093972.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///37470166619.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/sevakep.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/bazon.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a11d4c9---zojev.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14568534521.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b91c5973aca49984e8cef48db0693066/28389689035.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/mabezorejig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gacha+club+download+free+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 10672 bytes
SHA-256: 38a44a131ef9bfbd12ec2bfaa95a58a793d026150370ab4e050de964d03e9420
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 26636 bytes
SHA-256: bd3f90c60948cda49fe3f629dc30e6eb9a5eb0ef87799e34ebd514204d053d80
font_04_sfnt_off00016690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16690 16516 bytes
SHA-256: 6b4abc67adc3664eb538c1828a6c69f333ed68047692556274f45c66f55e29eb

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