Malicious PDF — malware analysis report

Static analysis result for SHA-256 a057cebcd299f9ea…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 04:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2cbfb1f9ba28ebbaac0b57e7bfff711e SHA-1: caa6803333c521e4ada4f6996d32f6c63ebaed3e SHA-256: a057cebcd299f9ea1a69d3c2b7acf7a685906da53bfc12b1182c5f52a9f5efd6
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=kingroot+for+pc+2020 PDF link annotation
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/bavewogosowuwexijesul.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/badexedesokekaloliz.pdfIn PDF document text
    • https://digireg.sk/upload/4380486286.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e8a74362.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mipiweja.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dotuxizujusizedevekud.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tajoxisotukekiwu.pdfIn PDF document text
    • http://mgrima.com/files/file/67745113327.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/16680088989.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/gepub.pdfIn PDF document text
    • http://benetalent.com/upload/files/57663781062.pdfIn PDF document text
    • http://annabarons.lv/files/files/wapevidumef.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kt4dfbh28d1n3qnlio622rqse1/pebuzejizubenos.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131571ec8cbf---gefoguxiredibogugo.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/6847956082.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/86e995dc858757c58494333aae38aa0f/xivapeka.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/63396834100.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/janibafibagizelat.pdfIn PDF document text
    • https://gangnampools.com/contents/files/87791903985.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/44878305202.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/mojojisus.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/pomirogojexuseji.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa81d00a8---87272625448.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/49657390739.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_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10380 bytes
SHA-256: 8920418676ed7f3f208d4266116f6e249a4cdd51cc21d88928e5c0ad71c490f1
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 18692 bytes
SHA-256: c345e9797e7849be737854b5846ca03b39181c88b4fa5a87ba62188726650691
font_02_sfnt_off00013e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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