Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5ef946bc72d248…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 03:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f381bc07d848900e3b059e81e2b2e2de SHA-1: 4c0b922898af2f1db3b169138d07b05ca8b3f653 SHA-256: 1e5ef946bc72d248f6d89bf87b9f05f0125d414313f2962dd4c16f8bb4cbb20c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://zamokugrofa.sk/admin/fckeditor/file/bapujutubijalulavemoz.pdf In PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/sisewasubafifuniviposab.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/49890713498.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/57417943580.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130a256496d7---63951176476.pdfIn PDF document text
    • http://islandpointfl.com/userimages/39760388940.pdfIn PDF document text
    • http://cosyromania.com/media/file/repejapapubit.pdfIn PDF document text
    • http://greece-ex.com/sanometibokixoralawijoxem.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/zunifuxopumiluxoriki.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/64408790566.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517085744.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/90418821642.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/jebisanilivafar.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f549e686---jedukasufafiza.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/biwavuz.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3169d7eac5---41945108586.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3afe6e9f---2185864236.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kulofumozafutu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f938f99b---48077804727.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/20969459372.pdfIn PDF document text
    • https://cargotavio.ru/files/file/66100710940.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cca9eb06d5312cc622ba82df0ffa41d3/20067279526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2010+mazda+5+manual+pdfPDF 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_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 10440 bytes
SHA-256: 437d2dd4854420ddcc51ee49b91baa0381b23822c8e8e150efa018664c8ace8f
font_01_sfnt_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 17488 bytes
SHA-256: 15b1cd645f959f13aeb148b69907e4b35a05210fe30d276c49e3e986620e8e4d

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