Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b82668686e58e9…

MALICIOUS

PDF

96.6 KB Created: 2021-09-04 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5ddf32fa3eb6c0692bb1df38fb23fb1 SHA-1: 999471909fc461a6be7e8b324adf811886edbdce SHA-256: 23b82668686e58e9370146bb532a83fa23328ef37f7d24625890f9dec1169401
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, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or engage in SEO poisoning. While no scripts were directly extracted, the nature of the links and the PDF structure indicate a high likelihood of it being used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://irastuff.com/admin/ckfinder/uploads/files/67311870572.pdf In PDF document text
    • https://insolite.lu/img/userfiles/files/33747691024.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a99rmi2mo6tkg7l3umh8pgjd32/zinokegelo.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/54163804715.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608720e084c23---pezozavekomubajipe.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/38426887277.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2fa00924373804fa1ca4b0e65368f3e3/juganikufasidiniwaj.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/2234411044.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a8mdmsrtm5kgn0opaknh0drr53/39950430046.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fevelujetufobasitigefenaf.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982eb06b967---vikulikenagire.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/89316795845.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f1368a86bd5542af1565dcc1704a3497/18456785812.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b921e081b---kumaputewudamufeba.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/13652914788.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/941574430c008fb03dcc317cf64ffdba/33757060332.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/serupelojimanal.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/10446389759.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/26795184962.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/52105371875.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3bd29b1c---ronep.pdfIn PDF document text
    • https://naoshima-habitant.com/3747420934.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/12f097365bb78aea38cf648b5308ac4d/nepobotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2006+isuzu+npr+service+manual+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 18504 bytes
SHA-256: 8a938a38cb928f0892cf2d87e14fcf0de766268d77a3d949a53e3d51e4b23c2c
font_01_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 11200 bytes
SHA-256: 259e1b64fb2c20ec9e94def3143c6392f92539f7b66234abaf1ab4fcd6f72f23
font_02_sfnt_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F06 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4

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