Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9848034d76153a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 19:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dd7926c58620237589dd8d44dfa3da0 SHA-1: 5ba22bb729f6796cb2a7259bd69f296eaaf131fe SHA-256: 4b9848034d76153aff2455698a1cf2f53fcdd552dfdc586b16c516dbe052f721
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure itself is designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=how+to+transfer+my+videos+to+sd+card PDF link annotation
    • https://heks-tech.com/app/webroot/userfiles/files/4588695194.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudasezelumijefebeninugad.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/gatigofodor.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/21839474755.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/15118462107.pdfIn PDF document text
    • http://xfswchem.com/upload/files/gasamuwusanuwimiwug.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jinokipor.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4f9ee28b773fbcb470572f7e79ad8666/76617964384.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/88049964213.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/66681716058.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tasovogimivukunige.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5a7e82fa26a1fc7cb28097003c5320b0/42409493072.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/94369241822.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/61021686068.pdfIn PDF document text
    • http://talleresjpg.es/img/file/golon.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/81943107702.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/95428848788.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/35299357504.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/wumexog.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/84938870467.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/19949245506.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/petaxefazalusegine.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/6076589613.pdfIn PDF document text
    • https://andana.us/files/files/65438448544.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411c7ad8280---guvakobubutorolir.pdfIn PDF document text
    • http://checopharma.com/upload/files/67794774281.pdfIn PDF document text
    • http://cudicio.it/images/file/61026686722.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 10848 bytes
SHA-256: a5e592282635efb67ed3719ef036ae976bd4eb81cb52257f0a75afce3b19b9b4
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 17184 bytes
SHA-256: 06f132a957e8b569bff441b44ca6c10b7715f1aaf57caf08cbbe39d197fe777d