Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f5478295bec526…

MALICIOUS

PDF

120.6 KB Created: 2021-07-02 04:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5f582c894bcbe801ed6bd509ae8aba10 SHA-1: e7976db023b245f9f374617d1fa49bdf9b6cbced SHA-256: 18f5478295bec52617834a9b5d5e4514cd3d201e249b5eb08176745e8c254bc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a large number of embedded links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://catamma.ru/uplcv?utm_term=look+to+the+hills+from+whence+cometh+my+help PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e75459908---90990072333.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kutodirotekonagu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/99385970865.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c5d2137e---24597168696.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/sadapiwokomev.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0086058641abd2643f6bbcd97a327c97/49653317576.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4137046ecbedd3ba35b66c8c7c0eb00e/34047073269.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jataregikebawem.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2ce3840---vevimuga.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d033d462b19c68ce12b98f9beb2682c9/19833624083.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3d8a6f8c1322631a0684ce9bf2e431a8/36677253976.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/rilolariri.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dumixevuzibajebuwokewe.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/pisajogadufonudemi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///64349434601.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/ruxowikexe.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210628015651873.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/sikoroxebiporanad.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821571d1024---81969588842.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/80858777104.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/29446711455.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/49307844669.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ff69024e---kaxagugowuz.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/88149d5c65c7e5a1dd738abec08de5b4/70481896755.pdfIn PDF document text
    • https://agatanorek.com/files/file/vepebov.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_off00015448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C5F 10832 bytes
SHA-256: 44984afade6c5b5be0d139a363e653c40c697727abbac9cb94f32884a5c9f0f9
font_02_sfnt_off0001854c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1854C 20248 bytes
SHA-256: 7b2c93fb110807fc55a42bb1adb054c50354334ef233948a85fd098c8b860c6b
font_03_sfnt_off0001b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9DC 17460 bytes
SHA-256: 10755c7c1d24b829687e184595d4b01271ace2c3e1cd8d0c1493dfac2d55822e

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