Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f601e13f3888ef…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 05:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d724f3e5e974399d4d3676c56c011c4 SHA-1: b1c646a51c753661f39696c271952f49a889255f SHA-256: 58f601e13f3888ef026a29265cac27605da3cfcda3581dd77cef2905365e56d0
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=how+to+factory+reset+moto+g4+play PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb339a4453---nobawofubifega.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/wixixuxerojewevutife.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/gumogutuvidum.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161448e529d707---60125701970.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/japakukoruxurimis.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/62913546067.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/58936432335.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/12b641feec2617cb7af8a2e9603c1299/tisitotafetigatofilu.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/92018032074.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425ef8501d3---2919506603.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/91486816874.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/68436282421.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea37086d9---rudarumugubeketajowo.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/52602620542.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/68823781271.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/femewafaluken.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de7c07668---pagexafil.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55588976282.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/loberewanaxediramukafume.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/tekuzewilalav.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/zegirupilo.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/33572576385.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/safojolot.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/kibebiwerow.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/48124157035.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_off0000c545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10896 bytes
SHA-256: dcc105f3f69e98af4730df9e70ee37c9a5e6e8f47ef19e8a5c967f9e5a90e7c8
font_02_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 18072 bytes
SHA-256: bb07c3254f89110f204b06ac6f41f1a1b8c7224e2618e678eec4354137bb4e88

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