Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe90c8c9f10376ff…

MALICIOUS

PDF

72.5 KB Created: 2021-09-22 15:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 360f7cbf09c4833b272a6639d9aee5fd SHA-1: d255c135d712c80c80c2d4041910061a8f4d7e62 SHA-256: fe90c8c9f10376ffa0d1f65494a018744a079d8031b56fe2e39666d32f71eae3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially malicious, sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://imdad-egypt.com/userfiles/file/66572368990.pdf In PDF document text
    • http://ahkkpcm.org/userfiles/ginuf.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dakalerovo.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/43733796170.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/jejikaromojipimolexonijo.pdfIn PDF document text
    • https://ebooksweb.net/files/file/biwabexefaguwusuxi.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/puzelixavew.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/53692002120.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/705826802.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/oufakl5mk15flaonqkoi8rf6io/budoguxo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebd965b9c---tifevisinakisamitar.pdfIn PDF document text
    • http://519pf.com/userfiles/files/23965599649.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/wafefedaworevoxi.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/rifatepot.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zisokekedixofewugi.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/81915143332.pdfIn PDF document text
    • http://labradory.pl/file/89478739736.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6opg259i14dul53l6ubejn96b1/nopavejigokaremu.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/jakupavosefugotavuzozabog.pdfIn PDF document text
    • http://bienbao.org/uploads/files/65644734223.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/57815007525.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/towaxikanaj.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/56527130842.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/65691726970.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210914022815.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/19830323502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=love+movie+free+watchPDF 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_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 10392 bytes
SHA-256: 4d5e7d325aff109ac05dabee35a87624e877527de4ce581180b73daa80652a68
font_01_sfnt_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 16664 bytes
SHA-256: 6a87cfdb70ce64e6b6bbef5be2bd6a5fbbe9c051b9e481d30891858b6fa97c41
font_02_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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