Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfff3a7d435d881…

MALICIOUS

PDF

89.7 KB Created: 2021-08-09 00:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3afa9e355110e4b33d45dbd544b14f9e SHA-1: 06b6502412c87d61b2f2fa4b50d6d14d3cae14c0 SHA-256: 1cfff3a7d435d881292cde1c101af22c36af77d599574e206d32ab433dd9eaf3
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malware or engage in SEO poisoning. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crewmak.ru/uplcv?utm_term=9th+class+maths+textbook+pdf+download+english+medium PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/xubilijemofojajujo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/odg5ep0l29hhif0ta6dnjo3cd7/lufirikapir.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zudigitinifuv.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/kirimubebujovazilazuji.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/shu6gqo7fihc9tq13h63muludm/feturutisuvuzokogur.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpdnsduro8c652sq4ohicpbo87/53046355278.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a5069fd---34191698932.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123686c7a3---71373139598.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/pifobopagilixawa.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/kegejofebazupewu.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/gogisizuw.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/javekegizejidudovo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/84846455558.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0e08d656956f2cf41184e4fb8f93e092/22735541703.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/28242119974.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ee45cd0559967c125cc03d5ca7eb6086/tebezififitarelinafa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6bf28afb2ac86b522d7b96c933712140/34954239434.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a76b7130c---fimilunadawepex.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/51777533109.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/74e4bdadc0463a788eff2919700b0197/29734499701.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mdj8vvdbd0ibb3lv2s6tsuia2m/gipidubiju.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609218ca147e3---84096992901.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/22791870792.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/93734740696.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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 11556 bytes
SHA-256: 3e97523ec60626883c6ddda1a2c3ddfa46bd55af93bd0e9c57c1977c6152d2f4
font_02_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 16580 bytes
SHA-256: 2b551e2654160ef59507915ad79f9d606957bced368042a81dba37335cfd287f
font_03_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16880 bytes
SHA-256: c7c434a37a2013ab3fa9d094c4bcbdd3b75f61112577e5bef592d288d4ae560f

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