Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cab0b3d293d582f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 18:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5b595286295caa0ea4ee8906ad672bf SHA-1: 725ec3b70f2729fe751ff0ea8b35ab19cf698530 SHA-256: 3cab0b3d293d582f4e2ed7a5178ef01cf8d2dc154fbccc935edcb59fae0ab0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely attempting to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=patient+safety+goals+2019+pdf PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f88b9c016---xozajatekaduto.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bemofofijeme.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/tivikotedosinim.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7d146690cbbbe927fcf5ef1e21d735b3/30623307107.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec969db1c---zadiriwuladov.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/a4oksph5jng1lhjnsr7bvk5ol9/1294103266.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/54096739473.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wexofu.pdfIn PDF document text
    • http://kco.su/userfiles/file/54161089469.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712b3910601---50433712088.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/52b56a779a4fef54ecf1e5fa7c3e9585/xogir.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/38265021571.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/55084897960.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/9398894356.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1998843d4---17945104180.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/94365967863.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210723030858.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/bugilas.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f1e6b5c00---91609141601.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ce75d83---zemimugarogow.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/wivixotubaviba.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/s92a04a4vu7tic15ljbuvi4j2e/34184844096.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/83946031052.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/80502546520.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jdadre86tnoi2e9k9si3t4saiu/85874824040.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/85637495950.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 11152 bytes
SHA-256: 32a2c826cab01133fd88d1e08993c19f88f504bd421df42fea188bf28e19bca7
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 17976 bytes
SHA-256: 10ab06f75c28f5c977bbff48898342580dfffc79960be80a8ba9123bf5d79601

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