Malicious PDF — malware analysis report

Static analysis result for SHA-256 362444c32b727e4c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 02:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0be39ee3e622c5a16560d1f6850a9d0e SHA-1: 09f6320136e481cbeb2d8e80aa38e240315e32d1 SHA-256: 362444c32b727e4c9583acb45ce95f119e88171f1c9c6cb01facb25e246d58ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dkind.net/userData/board/file/pukizomejebubuwase.pdf In PDF document text
    • http://logo4you.dk/userfiles/file/vadujujaweruposiw.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/85014160191.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/27717750360.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/42806217660.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/vajukevopabexizeniwamiwad.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/52792672958.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mavujimurotutiranaxup.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/69783257757.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348de9b2108---jidoraxutedepubis.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/10885569089.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/tekubukojopire.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/14145130666.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace3996262---93049482863.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wapebatevetipibirefirew.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/18951071062.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/53068163492.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631366626.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/61962297681.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/16466961428.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6hups4dfv0fhuhigqpkflnhk29/kidajodajabidogomeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=unit+elastic+supplyPDF 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_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 18956 bytes
SHA-256: 58e79fdfabed852cdbb6c93a592fec198ac417993309a3a98b7056bc95c40faf
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10368 bytes
SHA-256: b30a83a1aa20c2746c7f0c916244cb2dc8f83d139d1a6bfb6515bac84d3a6037
font_02_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1