Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc1d855aeea6e68…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 23:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e7435243c99eaba133a5a32d1a46024 SHA-1: a58d5ea1a5214f9bb4fa9c9249c2aa32176368c8 SHA-256: 8dc1d855aeea6e685ec09721a0b5d39d631053e247d259f20122f91449cb3827
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 as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous external URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=amarilli+mia+bella+sheet+music+pdf PDF link annotation
    • https://autoradiator.mn/uploads/ckfinder/files/99416914719.pdfIn PDF document text
    • http://119pump.net/d/files/82227138935.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/78209788396.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e3cd589246ebc456434126b937bfbdf6/pidigugakotiwenosab.pdfIn PDF document text
    • http://poorclarescork.ie/images/sewawoxametenagefonav.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/51606801202.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/nasuvivu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb20c25c17e405673474cde60eba8333/12209656783.pdfIn PDF document text
    • https://windsbs.biz/files/file/93009155134.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/kokabozokofe.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/86323169983.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3732277a---turajexufow.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1e1ca5c1a228445ab37f51a15e34dca5/52565111178.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/kulixedutojexanu.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c721e7c6efb741c4dbb188d945506a28/kumotulekodumexis.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/41279010070.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0fc1b8d2b91707e4cfd6d92acf7093d6/87744193871.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2n2uatrnc1mathdub8tjn6qtpk/74655953979.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/buwisomirigipuxaji.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/tureveretulo.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/12246496370.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/80312572312.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/jiweduzesenoriwupimadasim.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fe085026b2f506f1c528b96f9f5c4b67/54055825513.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/92867353135.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/dodetitulokigor.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6153725e4df0d947788cb1949f82041f/8488031632.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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 10884 bytes
SHA-256: 88f8b718ee229cb180a6aa5c151af72b71ef4461e02e451ead4f726fda10c39a
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 17452 bytes
SHA-256: ba98ceefa9bcd0af3a9078042e71acc4f593e5709c2c690848c2c87e37f89212

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