Malicious PDF — malware analysis report

Static analysis result for SHA-256 230b06a4ac158d72…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 09:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e55c21d93b5708bbedd880f6ca6f9417 SHA-1: 60a6b130272ea338c18e0328c02946d63595c2b6 SHA-256: 230b06a4ac158d72e9188151987dad8d4b69da0313090ac8d9fc8c6b07d6d860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4eb8e670b2a3693b953179c60a7cb34a/56491478447.pdf In PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/popidupamelufo.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/82179547482.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a493415d531---xebijixosajudu.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/simivisawumamanunoniro.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/75589911346.pdfIn PDF document text
    • https://southafricapools.com/contents/files/nekubupegedaru.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/29874461013.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/dhb0s1dnnag20qsm1crj17l4do/lotiputujetefedipi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/49823548094.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/pojijijajekuxubijipisedo.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/nomid.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0o6fnrfeb9ec2em9m980lslopd/29048968388.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/56396783594.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/lukidinigesepumidusit.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f2533ee7---kavevobebezojupugamafuset.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/11708646561.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca1f27e76---59599338770.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/72060815857.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160703430170be---wepewanebinawi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077304157c1d---30982764198.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/godukekubidexojod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=addition+and+subtraction+word+problems+worksheets+for+grade+1+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 11520 bytes
SHA-256: 3165bbc1496acef9bae7a59171f19c33adbd25ef567d59858043493ee6b64db5
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 17020 bytes
SHA-256: d0fd1524fcd6e43e8cfc94dbcaac4decb2767507d3d75c7403a521f26f3ebb1e

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