Malicious PDF — malware analysis report

Static analysis result for SHA-256 27130a39ce7b3753…

MALICIOUS

PDF

102.7 KB Created: 2021-07-01 17:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92881db2cb6039a8d302b1857727bc0b SHA-1: 75fb6b030650d0b39a0f3f4122f484a7488c98f3 SHA-256: 27130a39ce7b3753c5e00daf939abbda0ba38a67a85fd4855b6d45b88744b74a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c5f82432b87c1b254bd6e8886e6147b4/97676133214.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/73f0e2722eaf0cb498cfd87e03bd4541/87283706730.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/32879066033.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910ca0c3be2---zijabuvilawubujozip.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779c6edfc09---zotakafuruzopimutatolasur.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98e06605d---3695798957.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qufbc52la9oiu1ig34ft34pkh7/dorikiwuvexalato.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/lofawaxakuzinorapev.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6cb4a569a---30743544023.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/tipiwutikujanofop.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/baxebaxaxaxugatutigigo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0e7e9036b---nojasugiga.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81ed5a0de---78846752041.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/bobekomafelawep.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/39874093008.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8d7cd7ebeaad809f3836f8b197cb3b0c/72307612954.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/73539954189.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160965f96e36fd---89744858936.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/63314507119.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae7261a8c---visapugitixexobubupoxatov.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/ponakegodikozidipisenibu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/92108948109.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lm587khcc23rdtaph1fia6ss6n/36319632214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=public+policy+making+process+and+principles+pdfPDF link annotation
    • 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_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 11312 bytes
SHA-256: c200714009db49c7ea90ca4b03f00279bc835cd75e2f004ef61c875a7d1759fe
font_01_sfnt_off000147bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BC 17340 bytes
SHA-256: 59829d4bb78c593d65b41bf32144257779ab3f79cc683528e1b8eeacf6c4297c
font_02_sfnt_off00017503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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