Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c40a470553f28cb…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 04:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4482e0ad1e14964b6e32cac29b148e47 SHA-1: 82ab56e46e1e3433a6f4189b454a084c407b3bd9 SHA-256: 6c40a470553f28cbc65fc4b57781bf8be981f88df508df14c289b35a2333bd44
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous embedded URLs, many pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sjar-tech.com/uploadfile/file///2021091709044940.pdf In PDF document text
    • https://insolite.lu/img/userfiles/files/kavugugiliwixojil.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/44250604300.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6636a8d95---safapajujatefegobemosexof.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/josas.pdfIn PDF document text
    • http://dfanchem.com/upload/files/64314543561.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_1E1D6F9CB72A3946.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d27b150cf---bagisejox.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/verevolosawus.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/fomopa.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/81859631507.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/2612470589.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mukolibomefit.pdfIn PDF document text
    • http://land89.com/ckupload/files/silekalewaviw.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1cc22b67---67222888720.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210909190340.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/rufibewovorijopowo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15c07129e---fakizo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e21702ce---voxiranole.pdfIn PDF document text
    • http://tano-cable.com/d/files/teladus.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/33584540822.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/futinevasomijiwenawezeso.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kufidibajukiruto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+gta+5+for+android+no+verificationPDF 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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 10760 bytes
SHA-256: b69e563a6eabb19448b5600890c376b8bba467d9efcd926550bedc16c21709c0
font_02_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 17456 bytes
SHA-256: ed01a9d152caff31fb9366d8356a87040016576de7a6238ecb9748ab575e74c6