Malicious PDF — malware analysis report

Static analysis result for SHA-256 e310b2da9f309acd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 09:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e70c2dfd286f67935a082de1c66aa8fe SHA-1: 31a5b765298a73441fe97b4929788b685c797b46 SHA-256: e310b2da9f309acda0cb3326f6f424fd942087463dfeab598a142f4af82e2f2f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=how+to+set+a+live+wallpaper+on+android+from+tiktok PDF link annotation
    • http://tolaniprojects.com/userfiles/file/91804697887.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/69460777521.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/gurisofifo.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xamimuz.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/rupimox.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/buzonidefudazavobuvamob.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/doxer.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/31478363772.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/veler.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/mivugejafali.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/zilamafozotopedasu.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210905231401.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3eac90df5---wedadunexenebujofinipava.pdfIn PDF document text
    • http://sro52.ru/uploads/files/1360529579.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/katuzul.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/88177070949.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/71950664059.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/famoj.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/85102332661.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/24658830802.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d85f1343b9afe31d186d64d6def20e62/tivevatafere.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531fb4534---tomukifa.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelubat.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/fobetubimipobekid.pdfIn PDF document text
    • https://krossi.ru/images/content/files/83708798125.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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10892 bytes
SHA-256: 4f1eb397b2f055e4bcd3a50ea01e493515fbf7c9d66d7ccdefcc13336525d8dd
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 17836 bytes
SHA-256: 143af3cf03a5c2eb7fe68dcac2dc6beb2c7865361d47cebc00f472059ffcb508

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