Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c7f954781934a3…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 00:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f39902047c05ea81f61d92fe556859f2 SHA-1: 91242f30da0803ebf203c29b35dedaef8c02f154 SHA-256: d8c7f954781934a363ff21fc88802bc9a047714db115f8dc6bf768ffd89a502e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on various websites, some of which are compromised WordPress installations. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The ClamAV detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • 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://coretry.ru/uplcv?utm_term=worksheets+on+pronouns+for+grade+1 PDF link annotation
    • https://langumeistras.lt/i/File/64624723069.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/dagogexasepijixegiv.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/v4do11jpeb4rpimfnthb74atp2/92470205165.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/jizubowigobanapajiveka.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021527222914381.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e76eb763---43433623068.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/gng3jlhpmbq605qnmaq3eoko5q/wonufomiwa.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d56987e49c339dea196dfc6947f7d0fb/kezivorulilame.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/6017439750.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/zeraxo.pdfIn PDF document text
    • https://campermagazine.tv/public/file/jalola.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433105b539---zonizavesuzefisubifokaz.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/76932297757.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf170452c---vibol.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/xavakepin.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vupagomuvutuzalerojiro.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/demifilutivirodubuzapozem.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d040ef4038---bexiluloxazofeluwapebis.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kuwujades.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gj74bd177i4iotbev4f210gsti/13880532734.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/58966618892.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e8861e5f5640b3150ae22b1d58266b2a/nakozoz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 16380 bytes
SHA-256: 3a27f12e4758c3ea7bb48bb55ba9bb2b51dbb84ac525b1aa686714322b53f17d
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10876 bytes
SHA-256: 2e5c35c722385befc2e99b4b22018697fd85eefc5bb25544c817fe9daae1661c
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 17092 bytes
SHA-256: 9714eb36bbdd6210e52a1beaee701e9f4a5dcb53be617ef05743f31b4d2acf19
font_03_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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