Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0772cc02a7c2767…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 16:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed425e51602d39412d2bbc9c9d51862e SHA-1: 6cee1f5b5ec3acd0220ef3406d184ddf67bfc33f SHA-256: a0772cc02a7c2767b22056f359eb4c4f29fe5de9978e8691dff5cdf2cab22e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=mod+avakin+2021 PDF link annotation
    • https://taybaite.com/userfiles/file/xujezelosapomozukanos.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/levegel.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/22280507949.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/pavalukivif.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4676c9b36---nubizigaluw.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/wogitisasolemedozali.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/wodowujigusite.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/94826242133.pdfIn PDF document text
    • https://onlinendttraining.net/files/41081587693.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/71977466738.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021941611172455.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/43693224009.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/memezefaniw.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/46128506205.pdfIn PDF document text
    • http://www.77ice.com/upload/files/dalemupitef.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/wagugepudu.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1984293052613668ef263b8.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jedazuzat.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/madutewubodabakurifitib.pdfIn PDF document text
    • https://timminsrenovations.ca/file/jhi10tFdrEFuLdyd.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/14009301616.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134721fcdc55---balefoxipetir.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613619d6c6c7e---50473237444.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/3046804111.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1de8a887---sinakadexurewodinagupuv.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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 10140 bytes
SHA-256: b8e04905c662acd2ac240eecc978c557934351658f58b3378cc73c206ab3e900
font_02_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 19120 bytes
SHA-256: f8938d19a847a8b78c26f9e4474516bbe792e6194597d8be0ca276f1b3fc92e3

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