Malicious PDF — malware analysis report

Static analysis result for SHA-256 27558601ffdd6f65…

MALICIOUS

PDF

81.8 KB Created: 2021-08-06 23:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 52aae255d76912da9fd6ed066dc4c789 SHA-1: 82b4f8c7534f8a470e30f9aa57dea431b7557a8e SHA-256: 27558601ffdd6f6507c986c6422446cd87e2709aef3100f6934d38cb2829142c
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://tanthueviet.vn/img_data/files/rutir.pdf In PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210728055114.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/24960903605.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/ritozoxozupipazo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/pizemadanekijazumujub.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/28134966357.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/kesomesobegipazojemufe.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987b7c34a8---lidalorinefupitilikuf.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/58929421778.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/tagukaxurewexe.pdfIn PDF document text
    • https://puntoagricoltura.it/file/16406969183.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca8361693---30696580239.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/zamunufi.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9e27bac9644c9eb4d51f483fc6e2db3c/xesenedigidezikolo.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/fupomalewaminolit.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16084c093de844---86878889174.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7881b9b502---34266256736.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jksbku5svpkq7o18cakib0fdh0/tiruzosovigefusobefala.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a7b470efabdd09b9b3391797270f990d/xogukamisunibimiz.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9839051218268280ffe6d755a3eae01e/3992922748.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c964c99af5---tapituta.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa0423314---suzekigawuxagok.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vetamige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=breaking+bad+pixel+artPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 10668 bytes
SHA-256: af1e537f3e32862f50196fba30e61dfde99728c35acb19c7ea91a32bd3ff7d39
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 17416 bytes
SHA-256: 7f452f51847dd6f7db9ae4e5bc56629bedd2c785f8c0734fdaf0bb56625abf94
font_02_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16180 bytes
SHA-256: d64c8c6eec96a691c8f0017435fc3016a891cc1e3bbe78ff85d6c2ae04d6907c

Open this report in the interactive analyzer, or submit your own file for analysis.