Malicious PDF — malware analysis report

Static analysis result for SHA-256 215b9c4b2a3aa39e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 14:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2f82fd7158534ce080d120c18e1f962 SHA-1: cd10baa3b9dafc2ed10d6cb9d300b37c7e746ab8 SHA-256: 215b9c4b2a3aa39eac6f2907c1961dee828495dd79883c4ac742ae230748477b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://burchiellati.com/file_fck/file/sajavufunegasizu.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9ba547851---70312715755.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/wubisopenimutuk.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210721_070304.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc4ae42d7---3512202824.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/xikegur.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/vejotirugasepure.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zonidasudelitezerud.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/73822751079.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/desunonu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/kutikogezof.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/31822965824.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/64918488690.pdfIn PDF document text
    • http://poiskvod.ru/images/file/84883040866.pdfIn PDF document text
    • https://chp-travel.ir/data/file/gagukuzosudega.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/fusorimevusisalogorasadu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/cc6gts8eim9kfqg70b2ru230e8/84592385607.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b6a1e8659abc1499ccee4ba1d74e3b64/xugasulefizudokabofike.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51dbb22eb---46933785647.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/687c21599ad91230e8b8f53f9fe4b9b7/31423246400.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/wudixinuxojukonumejaf.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b681ac9ea4---jineriwetufotemeko.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3b560078---69608311330.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/60175217625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=face+to+face+interview+definition+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBB 16968 bytes
SHA-256: da33d07a4b47e082c54c618b75758e83df29e493e2151bdb25ca92ee869cb059
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 10528 bytes
SHA-256: 73dc8f4b5dafdfd6c13ce9887c2e5291372608f1784dbe7b71018fc773e114d2
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1