Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0af16b97070ac0b…

MALICIOUS

PDF

84.0 KB Created: 2021-08-29 16:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 160f5eaf95f8400c7e3ef84f477b3a8f SHA-1: 7ff330008cb1a47e3152d9114b9c9ae9236fed23 SHA-256: e0af16b97070ac0b6160a888edde398326d716a8ddb609f959caae04c815e5d8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirm this behavior. The document body is unreadable, but the presence of these link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cbc828d3325592ffce529fccc4e71060/34591337481.pdf In PDF document text
    • https://tylbm.com/Upload/ckeditor/files/26746845246.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210717020519110513ollt8.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zalip.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/geberamisudat.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/dezafi.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/rogibunigodisumusij.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/15a3f47d78f736bcecfb4ae627d9bdaf/31596052833.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3a642746---gezunufelukazi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b44b9cb855c219aa45da4e1a4083eb61/70723117090.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607474c2b6526---ruxan.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/sofab.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/4587865186.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160810844cb8c0---tatow.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210820144315324725809.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/24083769171.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/radapotog.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/86506769970.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c945a83f36---50655576973.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350a2bc091---6832294789.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jagorewumiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dividing+whole+numbers+and+fractionsPDF 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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 11316 bytes
SHA-256: a7d93259a0455f802149f310f34999b18150d40764131ad2413416f84b82f93b
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 17752 bytes
SHA-256: 0304985ed9253a68d37b265331a5f9afe64e952e6d5826bf31987bf00336227c

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