Malicious PDF — malware analysis report

Static analysis result for SHA-256 e617a474e2508229…

MALICIOUS

PDF

84.3 KB Created: 2021-07-24 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb55030b84b72de9c2dab3162f0efdb1 SHA-1: 606c5242fb26556fdc1f875f44e92101ae26140f SHA-256: e617a474e2508229dc3fc88cc3bb1fc386abad84b1b9d4768651fa0c1ed3b13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress installations, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b58554130---nowojukuvufokozil.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1105f5e0---53993663749.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81f60903b---27417176084.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/7674870128.pdf
    • http://minhvuongthuphap.com/upload/ck/files/89252023796.pdf
    • https://anandamsanyal.com/userfiles/file/30477055340.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/04d22ecec954ed752a7526b7557cc992/sufokobekevisupogubi.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/32946766298.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/47f90498df62d8be4e8cc8e61682d62d/68236766467.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97bebd1356---67675147546.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/59264287700.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/10847179008.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/llsao8ntgr5lral52i5s5o00e6/64496801075.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084e673670d0---33285280251.pdf
    • https://ayurvedaemart.com/uploads/file/panokutukudoworaratal.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c774d55a022---tijanafe.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160934e846b704---notodewobuvixif.pdf
    • http://accessiblevehicleservices.com/userfiles/file/41698832560.pdf
    • https://contabil-fiscal.ro/mm/file/ditojabegakodigunawarelo.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a973debb6c8---rafizuxipekeg.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/80e5018f38434d9a66c46d63a731a12a/50028855901.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd11d088f1---setarifagijopogaxebu.pdf
    • https://alamansyria.com/userfiles/file/19578114475.pdf
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/terukanapebototedem.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3728366845a82fb84331e9c61b930c2d/42979210236.pdf
    • http://sity-luxe.ru/userfiles/file/35296170124.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/36764544617.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=10.+s%C4%B1n%C4%B1f+fizik+soru+bankas%C4%B1+pdf+yeni+m%C3%BCfredat
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11e.bin
047cce91a62979220daa1c03c01136e1e4dca40223b8716be2a5c648dd7a47c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 18396 bytes
font_01_sfnt_off00010df1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes
font_02_sfnt_off00012608.bin
5fecb2cca39e14606de42be425c96f6b051a4433d4d35fcbf6d35288c8e7a83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 11500 bytes