Malicious PDF — malware analysis report

Static analysis result for SHA-256 9458cbafcf022b61…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 08:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c23a54e2312aed8255baf87a997b410 SHA-1: 5319e8377ccc34031de378a26a2ff4a473348031 SHA-256: 9458cbafcf022b61be07f37403138de89a622b5eecbb9df49f95a86cfbcddbc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://toolsatool.com/userfiles/files/62649653411.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbd93d926---kilemafit.pdfIn PDF document text
    • http://ergakiland.ru/files/files/93122409544.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/ferabagonuzaponanutigu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/bepomivumuf.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nifububajorogebatazo.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/zekagan.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/41927524342.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jozuxitozobukate.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/nulejilot.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323002d6620---divet.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905025333.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/63522122008.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/60614129096.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/wevelafuxoxibirof.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/47784124216.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bpspeu0b2mlfj5324hh82gt1o7/xidufupazafelafovuwuki.pdfIn PDF document text
    • http://nfc.soo.jp/file/56572040816.pdfIn PDF document text
    • http://armanetti.com/images/56610159480.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/74867621659.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/25112506853.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/sosupata.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/21228604518.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/59889026339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=animoji+download+apkPDF 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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 17868 bytes
SHA-256: 080068859b8212d725a63113065581d026876c0ee1f58dd77b352b54035db74a
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10344 bytes
SHA-256: 7d225408ccaad31486c3848001faa5aae44bec7eac7001714d22d4a87807561b
font_02_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1