Malicious PDF — malware analysis report

Static analysis result for SHA-256 9158b5bb91b1219c…

MALICIOUS

PDF

83.4 KB Created: 2021-10-15 02:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08dbdb51679fb267f66154a292ade008 SHA-1: 3273db5efa87f1d0146072da7196f015db7a6d1b SHA-256: 9158b5bb91b1219c744743d3256d3fb1b6b23d9199be76a5ea15c1ea686597ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and exhibits characteristics of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The presence of an embedded JavaScript stream suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

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://philabc.ru/uplcv?utm_term=barney+and+friends+intro PDF link annotation
    • http://citranco.com/users/files/wowovulolal.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/68849109682.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/73920164676.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/vevutalemadim.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/boboliwubodajuvamiso.pdfIn PDF document text
    • http://client.diffuse.info/files/geguwamufakimoxoxi.pdfIn PDF document text
    • http://cudicio.it/images/file/susorinujoxelu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/06ad660375ca58d60e7b56a4d4d63e65/55278028821.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/14770144393.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/31568107811.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210918232351.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/9753778480.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/sifajejepamo.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/nerorukogelubez.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20211004000832_496512744.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16159e327a210c---jobaxojuxexusobejisajaf.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/58107197127.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/30461746739.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/62105157672.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/netozon.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/wepamexubebuxikuraje.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/31488002004.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gufekupusifugi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9d4fd729c057cfbda2687a63cf960742/88074837141.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 16848 bytes
SHA-256: dcab4de158a675f39a8abfc7ebef5f8b9c04d78cffb43e06ed2126263e40a1ee
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 10468 bytes
SHA-256: a4f8dbede492e95a31d58d837d6b474817e0969f66c967b4f52703bdcb7fd12b

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