Malicious PDF — malware analysis report

Static analysis result for SHA-256 380bb559ed309179…

MALICIOUS

PDF

87.3 KB Created: 2021-08-02 03:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e01374b6fcf0f6ac1fb9ccb81165dd1 SHA-1: b45e4932f4b295fde195791e5a2b085a5f73b8e6 SHA-256: 380bb559ed30917977613917b4806f7cb79867038ea6d69c6799f835f0529c66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware downloads. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=synapse+roblox+exploit+2019 PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5a4672a1---43298297598.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/gijatumav.pdfIn PDF document text
    • https://bursac.net/userfiles/file/tepefak.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/91090224979.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/37136769738.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/cf2992c84c4a2335390f0c4bdba8ab17/nufamabegelejifulez.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/93263777500.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de767bc4e---gonofilenidu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zuvovokugo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/jason.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f66069bb955f7137a163feb56aad67c7/25051611629.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e0fe0f646a72845c2934c12f645600fe/67654561928.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/78taip3gc6ctvacu6uqjqqose7/witedokanaserogome.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47cd88681a---35462993252.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/miziluxikofidodinowak.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea4ba478e---55613674867.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/mekoronadodudaj.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zobokozusepaludipebedute.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/tefafopil.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f522a33040---nuxos.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6qe4lqltphcro098a9v3c4i2d7/52501052980.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/88ae146542ed1817e0281b72986d574e/walitawexapurevoke.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/oopbql3ktvefhru78radlvlcn7/16943935555.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dufoxekejebinoximimosuz.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075847f3566d---24947156138.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 21232 bytes
SHA-256: 7354c9e8419aa425069fdda28fe7843830018cf2aa55082443259a2b915c73ad
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba
font_03_sfnt_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 11140 bytes
SHA-256: 696e90cb1078ab8e5c2b4278f4a915e745dbd6ae6ad4809ab6d574e7268aa33b