Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8badbf8cdfbea4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 21:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db56011b27c5c4fff363e1c7efa2f182 SHA-1: 051f4a8b023b3dced035400d7afd40269ad366d2 SHA-256: 3c8badbf8cdfbea41c2436da8f711ccbc49a194496a43f44714a48ab135ad375
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16113596caa161---nurofoludujudisurebaxu.pdf In PDF document text
    • https://bloomeng.com/uploads/90660654576.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/tabanilixemanazatonugafo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ei38riqkr0nh2jrmhk4drtp7hc/10508858936.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosowopovibes.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/dusoxeromovopip.pdfIn PDF document text
    • http://stylekd.ru/files/pitubenoxaruzinenoxodo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b73fbf5d1---ruboxosiluwitidamuja.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/javasorajojetodas.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/fikujirux.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d908aef36ec068113a44586722dd6f24/mevofujopurakozizo.pdfIn PDF document text
    • http://hjhchem.com/upload/files/56914370550.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lmk6tau3s9ntl30h6ptfi8bp3u/52605435195.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d763e5717e2---wawufegozexan.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/23319686690.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df9020f23a1---96186186358.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/xurolesomumatuxo.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/vidupujetosowez.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb3ee411---berefifufaviliwozudifebir.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/lomodisavonigit.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/sepasidubewekufo.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83057329361.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0f0dd204---34383793825.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/lugolojizexi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838319b2b9d---defogogez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rotating+shapes+worksheet+year+7PDF link annotation
    • 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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 10872 bytes
SHA-256: b6bad67bf8d809fd1ac9991d766d090184d209be5a471f2398fdc02ce385035d
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 17396 bytes
SHA-256: 781bfef658c0b1fa90d89ae8a5b5e7a06dc5324ba92dda7f2eba20f9e088fb9e