Malicious PDF — malware analysis report

Static analysis result for SHA-256 6213d2ee398a06cb…

MALICIOUS

PDF

79.9 KB Created: 2021-08-23 16:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51f1f0ab7fcedce39fe2f37cd5b764b1 SHA-1: 9fb90e5d68c224bea1b1d2024ab8e90d3e11f1f6 SHA-256: 6213d2ee398a06cb823ee502aef550d9be35cde8ff2b8a10e1fcebd5ebe99448
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious content. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests it is designed to redirect users to phishing sites or download further malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to artificially inflate search engine rankings, often used in conjunction with malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=simple+compound+and+complex+sentences+worksheet+with+answers PDF link annotation
    • https://questyme.ca/userfiles/file/64782507968.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/88972265864.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vogimavativakera.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/363db12f4acd8db209b5f12933078dfe/43294956915.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16084ced3dad67---1916336830.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ookml6jm8oilh69c2s0c7gaek/fiveli.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa24dd0440---nugadurafujeguwusofilak.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/706824ed169fbbdec1e8a36305f93d8f/61278451169.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/lavuguvo.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/20616444031.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5f23c054d6924ba5aa3ef5fadfc781c7/36309842187.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083eea84ac9f---67258225675.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16087e9a45c75b---xujosu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7a9e7423877f3089bcc8525a1e1d3908/41017226029.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2543d72407---86157706993.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lototixuwadulujamonawus.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/37339649113.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/pebimevala.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/dirakumusivazibarofubisa.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b0a6a15ea1bc1062ae9d4ec479e2dac8/gaboloxibamalidumakalupu.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/2237450324.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/75324758992.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/dimiretewo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828ce78a02d---rewed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 11232 bytes
SHA-256: 1a853a507f5f1daaaf0803deeb89ce6de4913791b3010464eb56935733e8dde3
font_02_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 16572 bytes
SHA-256: 7d4bf363409e68f0d14ddd0808c8b5b1295c1fae3ecd77f7b36c7a21fb80c509

Open this report in the interactive analyzer, or submit your own file for analysis.