Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b4e0fff1995aed…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 18:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8017dce6863c6737e9b836a30c0bd268 SHA-1: 6ade4083d95a7fb178f91e668e102306e78b952a SHA-256: 99b4e0fff1995aed9d478e78e16b714b1084d0ea75629333e96bc9c00df57ca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads 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 malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://atsolution.org/userfiles/file/20210827153515207803343.pdf In PDF document text
    • http://studiomistretta.com/userfiles/files/7059769932.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1e3f5ef1d---nuvoxulira.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///bexosofafezibigo.pdfIn PDF document text
    • https://immobilgold.com/file/37882693334.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24b665291---11459803273.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f6f966fa0d83b3ba6589baddde444aa5/40964222454.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd484fee3---zevenadokitubipikufasix.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/78149355637.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/65996201865.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/24945610216.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/ipbo1pj31452hqpkua31eoh9s3/88804895080.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/funulopaxis.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/66486606158.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a205b6e0d9f---davexan.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/gasabuxe.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/84757c5566b6cb3ee055137d89079199/juxixamapanajuzasemag.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/sedudufelavifuzabemeza.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f074a870218---mepurawanejofimesafaw.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e336e38581827cca5ccedca83d3ee530/dakabolo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4494fd4f---9308351281.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13541ab494676eb1cf7419631f7004db/fukuru.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cvkoaui1c6pp96l586hg7f0em2/44901317248.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726a8199f2a---romudovegezufix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vestige+products+price+list+2019+pdf+downloadPDF 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 20416 bytes
SHA-256: 9d4c9977a8c9d8ae5dcb2127b301749110e4fa7ffcbc686188042d0e06f2ae1a
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 13728 bytes
SHA-256: 6a85b1dbe5c10b6ba4564712d1cc8f9bae05f3126d162d8cdac29392c84df70d

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