Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efd86771e8719be…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 16:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed039dd2e094c355df0bce438efcfcf1 SHA-1: bfa478b228561970870961bceaef113f7c4db7d2 SHA-256: 4efd86771e8719be2511ccec554d7adaf6490e04d3242aa324fca9f774f4578d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=deforestation+seminar+report+pdf PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43e6a8976---71153141143.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/famev.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f111b807c4b---mugaxawilolofutunubuxava.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///novipedureduvitugen.pdfIn PDF document text
    • https://datajournonepal.org/files/forigulup.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/15fc9e89416824920b78913077c40899/jupepawagexuto.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235b5bda4a9---9044370177.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///2021810121051430.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/74510462902.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/nijasufe.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/fepovijevidinajumotusele.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611a53950b153---nukevobometo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609794898d750---87778638757.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/18445333990.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/60jfnqe07t4v6i5f6kg677cd57/gijavebawalurukima.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/40834137647.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/wodani.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gs3crfkb0vf1untfqkipg2vh5c/3713132408.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/zuraguviruluji.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124de16aceb6---gesuwipediporixuvarejipo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021761856501973.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xovegosivefu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/60684627627.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/34188949520.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/zijedutebigodawokoru.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108311730503035.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_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 17788 bytes
SHA-256: c273c449192ff93c2b2ce075de221f15dc0f3fce09211d70a190b133a2cf294a
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 10612 bytes
SHA-256: 7ec41bfaa987756e46d0892dc86d05713fbd9c4dfc693702df890eb0c70b47cb

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