Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaa078779499ec9…

MALICIOUS

PDF

96.6 KB Created: 2021-09-18 09:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83864042847aff3762e7dc8623baae91 SHA-1: 735844ac0fcffa06c2256f74834297d2dc33cc69 SHA-256: bfaa078779499ec9901145d39d92b2d177e912a3753a4c1666f72cab4b5a2909
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 8

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=sinhala+font+pack+free+download+for+android PDF link annotation
    • http://01host.ru/userfiles/files/gapuwujetunoz.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/samaniwolagaxudujag.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd73989401---fovugirulurum.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/70586818792.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/56318670782.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/pokironefanezo.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/36037767418.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/roxanodogunujezipumu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/00a4d1f550ef1c83279e8dc17de1518f/62488177928.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/kerunomofijeniralejimebu.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/rufipuju.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/43862067341.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/fefanidojojigewa.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/fifaxunowiwudeti.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/zudasalaxibumero.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/29366195543.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///mexaman.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/67149454346.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c03c457c46---ponazoxuleti.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/87978281226.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/vojutomirato.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/83879073554.pdfIn PDF document text
    • http://napiarsaigh.com/images/71881196304.pdfIn PDF document text
    • https://preciseenergygroup.com/media/51073225214.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10804 bytes
SHA-256: 14ec428bb6cde3c94934c085159733acf73b439eefbc975b9b52fcf1bdeface1
font_02_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 23284 bytes
SHA-256: bb20f2793650b165412be617f23d549d3299ca89334413d1965bffe5ff993c8f
font_04_sfnt_off00016aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFF 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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