Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcabdca99fb38db…

MALICIOUS

PDF

109.1 KB Created: 2021-08-25 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b793b6dd8bd9e97542bf97592f49eb0f SHA-1: 83947a823e57b0faff9db4f98028d3374cdf7bf0 SHA-256: 5bcabdca99fb38db3c0269b0ad18168a00187383b364713656f170c29dc0e614
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests a potential SEO manipulation or phishing campaign.

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 https://presstone.hu/userfiles/file/namizopanunirojevanid.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sspu9d9v2vkq3ckqv9j06dd6h8/buzoseruzijem.pdf
    • http://hitecds.com/userfiles/file/rafavemimuwemaxizapi.pdf
    • https://deltagroup.bg/uploads/file/galozemilesedevusikape.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcrfhr7kr6f8fam3bbnmac7so2/xusikiwokifis.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ddh3i7388nb09s4kcd5hn7tiko/tabovamudujiwobetaron.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4218708926---tejudopowapovonisakifemot.pdf
    • http://vincitydata.com/uploads/ckfinder/files/80763693313.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/879a1368b6ab8a6373b46404efcd6d21/powipu.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/ruxasew.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mg5ivip8ppith8p6d0n7jlpdo2/puzabemadovunovemusipis.pdf
    • http://frickcontrols.com/uploads/files/47331806840.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/13oknfpk2cpmgmupqk5q6haoht/70402266580.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb19d880ca3---kujubuneduviminuv.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9deabf1b6d---31470737807.pdf
    • http://beccaro.it/userfiles/files/60401923246.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/wujuxikabifovopo.pdf
    • http://kochamsushi.pl/UserFiles/file/simanusuwujaworapogapogod.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89320b8db---gupotavumajos.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96b36005a---jogevolugirofaz.pdf
    • http://leaguengn.com/userfiles/file///wegikejoruj.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6c0d60c1be63dc13c1350722bf842c73/48500634098.pdf
    • https://voyageaventurenepal.com/upload/files/roduziborejuwupezuviwima.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68608325f4---7593203791.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/p9vvrunji86n16sv6117cb8ec5/87623216335.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=index+of+insecure+season+4
    • 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_off0001477d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 16792 bytes
font_01_sfnt_off00015f8f.bin
9791119ed8f8d29018d2ef091e6ef46fa06bb1e1a981cedad51b49a55dea0fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8F 17612 bytes
font_02_sfnt_off00018deb.bin
65ebcf95297d1fc606558ecef5a26e5f79894dab064bc0b93cbe73bcca41357b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEB 10556 bytes