Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc556905e7a78c3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-27 06:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc5d15a9656bbb8e621f4936df6a23fa SHA-1: 5214f6f3926b0eb9d1554a332e69d04472719913 SHA-256: 0fc556905e7a78c36880aaef4416d507cd412efc63d448ccfc2d1ae22e3d3720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=watch+oldboy+123movies PDF link annotation
    • http://rungrawin-itt.com/userfiles/files/xuwigekitikexupofaxov.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/66419085159.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/tupewodefuwirilo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r69bbqh6ketth398dbepktqd71/detavugurigitokotef.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387fccbc028---mofasuvad.pdfIn PDF document text
    • http://186086.com/upload/files/26901793579.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/af5e17129ae5aace491be207b2dea197/18573920299.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/21095864110.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/birikoviwabosuviruzesa.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/19247223827.pdfIn PDF document text
    • http://artediapharma.com/upload/files/togad.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/7058315907.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/vagajevibijefafuwibepiki.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/xekoji.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/11895113381.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/kugamadovotipi.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tarajirote.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pojilopugezexajaxerewates.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/dakugo.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/nezofojusegutefuneniga.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tezapetetawog.pdfIn PDF document text
    • https://csn-alliance.com/data/files/pugotikugaxelarijoguno.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d98a8549713b658fc243484a00aed43f/fivibosipuxotepewafamizep.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/15210604189.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/11696552572.pdfIn PDF document text
    • https://zhansq.cn/upload/file/sodor.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_off0000c0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 11088 bytes
SHA-256: d0279b5570a414ee8a2a1438ffade7c3ebb3c90accc76245a54c86460c2f474a
font_02_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 18880 bytes
SHA-256: 432381bb3e67b689eb7af6c2fe6d897fd6f13aba5e010499816b4823ad2f8062

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