Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9382a0110dcda35…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4d05ac8ff39387a2b98840786fc717f SHA-1: 16b4c54d586bd645a1fb1d4ec7a7a27f44a30813 SHA-256: f9382a0110dcda35a25d5b4fc7606ef0ca46152e7cb0235d62daaabf2b363f0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=recover+data+from+broken+screen+android PDF link annotation
    • https://vr-spagna-20.effievirtual.com/galeria/files/xalesezefunobenekifazatof.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/81140561852.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/fasopigudenofixewazafufe.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wedifoboditomi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ddd0e861---12271623232.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/62466750074.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/14756577339.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/28183642270.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakorirawokoxefuv.pdfIn PDF document text
    • http://c-amc.com/upload/files/kenep.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/tuwozomojapowawutan.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/18711508941.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613400903a9ec---tujolesafewawow.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/zuxozajofaxanovosebe.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/71080964687.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/kafakajatun.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/bidirojotiwoxega.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f37b557823cdccdd7c0cda6b4bf75043/17578317177.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4aedb64e---fadedu.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/kiwovuvodirarusowaxox.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/galusawibubu.pdfIn PDF document text
    • http://word.mn/uploads/assets/xavuberuxopobumikulib.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/72882649507.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/3506589424.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/34032587554.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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 10936 bytes
SHA-256: 907dad7acab6575acbf18712383a989f05e5c54d32280bcc557c681cec70b4e7
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 18144 bytes
SHA-256: aedc900105eeaf825a5117d0072f3ed09a947f4176eb7552c28e2cb650ef980c
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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