Malicious PDF — malware analysis report

Static analysis result for SHA-256 89273e04914837a2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 12:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b9f2d78b096fc5d655fa69f1dc387b5 SHA-1: 2436ab506f9cebb795efb743e683e3c4d509ea34 SHA-256: 89273e04914837a25f531ab6e39539b82399b41628423f5d54ddc058722ce7e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=pokemon+fire+red+online+unblocked PDF link annotation
    • http://shahgrp.com/uploads/54366178791.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/rulonunekobu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jtr49uvgkmt3eh4icl51edqev3/laxorifatumin.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210913211036.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/xejapozilufepotizar.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3d7daf7dea3fc39abddff0b0cf5995ca/48140694164.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakajenoli.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b4fab1b7bebb9fe8b479e7bd48707dfd/dotuxudasefegox.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/sutejebo.pdfIn PDF document text
    • http://101balkon.ru/upload/files/3128278707.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede8e08993---maluxisigudawok.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/5826471679.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae78b44093---40801368674.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/76264294289.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/rewurebasijubevi.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/19082336158.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe233fa1e---28310957732.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ibebeccrsgejrpq5addbj0mc33/tasutikijabumuv.pdfIn PDF document text
    • https://wittnebel.dk/file/selisepinizipusewemafos.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/jotuxewuk.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/11603733623.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_040623.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_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 17632 bytes
SHA-256: 79de1a2d3b270da72545484541ef449e8316c6f9c4b896f16944e7ee69e6d222
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10544 bytes
SHA-256: 5f5f605c3aa4195265dc49d25351c140e5a3c625a7bf04d97668f215ad505c66

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