Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fc4a5c02b37dcd…

MALICIOUS

PDF

87.1 KB Created: 2021-05-24 20:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07707819152188d62663766a08fde8e3 SHA-1: 8499fefd0d91ff47d468d5bd6895f7ba0cc3dedd SHA-256: 99fc4a5c02b37dcdd76f31f5b8bb94ed501d0b7bffb2da2c4738350a5d1c5def
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely as part of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9ef9c8ea2011cf0a765fa775d61d6a6b/62904622448.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079752be66ca---14401648236.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e5j3ltmifd99921t5shakq52po/33807316292.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071194ceeef0---38371155861.pdf
    • http://adance0112.com/upfile/editor/file/kijorusiwozed.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757e6e59c58---pigis.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff821d7771---2562065756.pdf
    • http://project-lovcen.me/userfiles/file/nulip.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f5726144---mofijuzewujuwufim.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/7943589932.pdf
    • http://stalmost.pl/userfiles/file/66871127633.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9c4f33d63da06f9186e487966e4d611a/49615637668.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd32ab7e8---degenaxebivunobe.pdf
    • https://actorconseil.com/files/file/98504545967.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/c9352ac7734669d20d1dc7fe35ee4f8f/sefidexinalitexaxosewez.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9f18be0f---lebazevijuxajiregetados.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+play+jeopardy+on+zoom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011045.bin
bc2cf03d808bc838f9e45cc857eb347000e60fa97cf2e6559652d0c431e62ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 5208 bytes
font_01_sfnt_off000121ff.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 1800 bytes
font_02_sfnt_off00012a8d.bin
ab23c352be18e33d67e93c8709cae5ad34bc578c4abe632170b62cb8f3683e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 10732 bytes

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