Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854893a9616d2a3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 00:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd1e45dcd1868fa9dd838e0409e8fcf8 SHA-1: 7ea7056be33e40e73d02c5e609117a01bc206ba4 SHA-256: e854893a9616d2a3aecb24dc62c639712f8c14263238546cd07ee149e6cfd926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of these external links and the nature of the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=team+clash+3d+free+robux PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5d19a951---giwiripaxutifusejub.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cb8c3adeaf8de76854d2102ec647d0ec/lagesuzojanoterika.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/fonufinupofabamudewuxoko.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/nixomagofe.pdfIn PDF document text
    • http://idroter.org/userfiles/files/94129128087.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/27312030044.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/sepili.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/lofajanekanivona.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vadixeziramodadejawobife.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161382604411c9---molazezitusijudux.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/doxenisukawuj.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/98354496142.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/lugipufujosokabufen.pdfIn PDF document text
    • http://potya.com/felafekazokuw.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/68744418125.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/35805610226.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/85175998191.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210908074835.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/48270365975.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gowuvop.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/wuzobesuregax.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/bokufe.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zasalusonotofeloxaripu.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/jubobexe.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7252fb465093417a344e9f00487a4f42/bemaforezoxebomeb.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/kupal.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 10924 bytes
SHA-256: 5e89cca7b297c6b8388e077bf940f44b4256cf8c2686d50c4dfb28a2d232a7d6
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 18128 bytes
SHA-256: 5b95232773f8e5c33feb4760133c4ec2c83d0279de86e0a35332c2944f266fbe
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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