Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca6f1eea28d3113…

MALICIOUS

PDF

84.1 KB Created: 2021-09-24 02:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: faee7ffe046dc7db7b9fcf2f4a04d7fa SHA-1: 9b8d33959a539e7f6192fc38bcbe03f40356eec2 SHA-256: 6ca6f1eea28d3113e09bc185cbf104710243683057cae68edabda89273c99baa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these links suggests the primary goal is to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=how+to+change+the+font+on+your+phone PDF link annotation
    • http://xn--80aesyq.xn--p1acf/files/file/xerusupu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343809b0e14---koraliwukelera.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/23861535467.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/23332024183.pdfIn PDF document text
    • https://fong-cai.com/upload/files/komasesufinozegip.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/miluvijagugarotuwi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c984656c29---pasovajafuwinoxefep.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pf5te4bsqh8tvh01df0n3ndpc7/kudoxavijiwalawose.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/xomiveguka.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/6941400656.pdfIn PDF document text
    • https://semut73.com/contents/files/23990738196.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/75685201054.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/82219998516.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/88505029691.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/63345710088.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/dikilipadilovigolamid.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/21335610440.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/bidixagajanijafala.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/59003632342.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/93651503484.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/tanazakikawejinimowotiwe.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/losegenegewikiti.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/77944930769.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/mosedisuvidorojuzes.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/19364014694.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/gezegevofotesirilinevixu.pdfIn PDF document text
    • http://donghotam.com/luutru/files/47484881163.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_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 17996 bytes
SHA-256: 9f9f94d4f50b2860b5b13ea0398aa49d9f8f3767a898384b2f11d0eaccf9082b
font_01_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 10744 bytes
SHA-256: 540baa6f6fbd046ca16b570b18aa905cca0b1af409e89a4de2e04ea0ee33881f
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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