Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6273f93daa9aac8…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 17:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e98c4a3278ddc045a7935de750de57e0 SHA-1: c8785effb38a803ccb4072456cffb52f364d4f3a SHA-256: b6273f93daa9aac8df89a092b1ff0c9ab76ba6b4ba8e01534267df5a0d80c93e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=perfect+naan+bread PDF link annotation
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d3d0ab80f02fb4decb6870fce225ecaf/rawunilevuso.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/dowazosujupenuxo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xopogoluzeli.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f7ec720df148b8aa0bace0e2be6be4b5/63348688674.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/50038576915.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/girafawapere.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8da4fc24d910122daf6d8491d81a789c/zupinoxon.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d86847262---wuxevulanew.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/thlnkpb092kqkt1qccfvrofe10/14590674742.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2901a2fb---82471173464.pdfIn PDF document text
    • https://combrooncom.com/contents//files/jovoda.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8e04f01f68634e08fcba4df614aeedf7/xoxomojelobikumugobosele.pdfIn PDF document text
    • http://sartor.ru/upload/files/dakolorokoxiribefewebefar.pdfIn PDF document text
    • https://maturana.cl/upload/file/dasewadekivo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f7156a952db326961222bcb17d1c6fea/5875810150.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/66ac7593b310b8a57a67e4a0697e3e02/28248556338.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/xitimesavanol.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/sotokaxarinilobatova.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/260104625fb17a1b7a9a2d517e718c4e/38741738506.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/pejitul.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/d8f764c0790f2e5a8ea13083cbb3309b/93850868391.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a529b0ee8340f8f9801e0f9d8d88f20e/38816723312.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1mftr7crf8ivtgqiaikulbeta7/lamuxadabotuwewasaja.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021642355434073.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_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 17528 bytes
SHA-256: 42655cd36ebd039d97ea44fdce518d7ed5c68d1f684311b8af0650f1ccb678df
font_01_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10184 bytes
SHA-256: bd1dd9698f3cd08ce8711b14a33ee2ba86bae6b31a0ad2131034758dce6caa61
font_02_sfnt_off0001320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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