Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18641368ab0be81…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 11:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae63100583325ac46187414f1d0d3a08 SHA-1: 05480f5375b3d3b5b935b31f677d61edd6970c6d SHA-256: e18641368ab0be813752bdba717b797cf302a913878cb1ce221e10e4faa99956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, many of which host other PDF files. The presence of 'utm_term=download+crack+adobe+photoshop+cs3' in one URL strongly suggests a phishing lure for cracked software. The ML classifier and ClamAV detection confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/48cf4c2635dcf950f2cd86d5042e4329/tiborijirova.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23273647936.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/jisitasojezub.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/45029372340.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/purevasagu.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/95860702492.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9fe28ea8ec3b281bd073e537844275cb/dadirazanewov.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c904fe6d---xapalarofa.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/13805357572.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/274aa545dd4da61d90eb7bde844e80aa/64529051659.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/59098876644.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/26225431789.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/69040631766.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/759fe58b89c817d77cb6d541ae6165e8/18335604656.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/52565040478.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e22f70a64e---89704942721.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/55563705150.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a4596278252504d8f9fa6c00004b7a73/wifogagodufono.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vurujim.pdfIn PDF document text
    • http://immopolignano.lu/images/wufopilerotexapeb.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/12fe13a018a488151fc9064762bde116/48225234882.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/72576947096.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/82666357472.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/26566774392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+crack+adobe+photoshop+cs3PDF 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_off0000b1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AD 17012 bytes
SHA-256: 79088940bfa285d48595ca1e7e501a02a5abca57145485db02701ce5d7c61243
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 11008 bytes
SHA-256: e3ab74f76a732b895a7b3c9c5a088e414db7ac2a4f53af7d7a918d3b0aff0820