Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77fa125e1770b2d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 21:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1db0c5bad3cff333dfd69d51816a02c9 SHA-1: d153ec72b6a738ef02a35839e11d6e1081f6a89d SHA-256: a77fa125e1770b2d8383f7aee523c2475a4fc05c47a68ba15b9735fe88179c50
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting an attempt to leverage potentially malicious or deceptive content hosted on these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://grandplaza.bg/uploads/assets/file/gudodobesonetovibilixuz.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16139182bd04ef---21184065546.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/88605559576.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/pajorenibaxulul.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/forisodubazoparujunibuv.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/48016984414.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/nepefefupusote.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/84765016678.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/dujorejexev.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/37462770169.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/repuf.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/35390280367.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bemeperufut.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/20240723553.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8ddf0d12---xoxetupotigine.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/tetinepimanupasukeza.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/furomesuxokedatogobekowa.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fabapojozor.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f9125123---manowukopinuzawomumovobev.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/90501151192.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b903946e---piwutijorutemibosim.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/rimuxusukireni.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/kevegi.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913045603560942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fluid+mechanics+problem+bookPDF 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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16420 bytes
SHA-256: 475b6e4c3da714b9920415227c7f0d56b7c02983ce533c5d2a208779198ab80a
font_02_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10988 bytes
SHA-256: 51c78337cfc44ae7b64130d8e7d7955784cb9e39eb8e5b08cc28c56b71719749

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