Malicious PDF — malware analysis report

Static analysis result for SHA-256 d158506cacae9d5d…

MALICIOUS

PDF

92.2 KB Created: 2021-08-25 11:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ac09b2016b7a0c12b454627de4f8b0d SHA-1: bb2fbbac0a260c78ab2a97fed542ccdd392e0e23 SHA-256: d158506cacae9d5dcb91c6d2d83945f1fa09d8976f44602afd5b91fb6f3d16db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=charles+taylor+religion PDF link annotation
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5o7g9n6v85rr89rnu5maimsk92/kakogufakidafozew.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/70932394161.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t4aq01jr6k4ea4gq1qughbcrdd/figenisupujanumisu.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/xojememamob.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d0574a096fcc4fe7bf041424186bcb94/tipajiromep.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/bawuru.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b2928950---zemupeganikorafewo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/pazawoxezixo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfee46ed8---modebunazu.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/59796180774.pdfIn PDF document text
    • http://riceart.ir/basefile/files/2193208279.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082798b1f20e---67783884287.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/75979888445.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084557ea7eba---32432395183.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47403340629.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/86893457221.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/13417550499.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6be97512---zuzezusorom.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/16221287815.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca613e945e---63714020519.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/niwewefuralovijates.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/48518859190.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/67344059244.pdfIn PDF document text
    • http://webursitet.org/Files/file/fodupasifaxev.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a893c4b95---kutafek.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_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10532 bytes
SHA-256: 1cf9447ceb1d94d0bdeb9106062c86c114870578d40c462140928e06afac1a0a
font_01_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 18272 bytes
SHA-256: a92e7e96ff30fa991c564b3ae9abb6bd278675a54676c54d3a6139531dcede60
font_02_sfnt_off000148fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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