Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c5af3fd53fa6d1…

MALICIOUS

PDF

92.6 KB Created: 2021-07-04 20:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da696b6e95a6b05e8307b847d4d2a7fb SHA-1: 456144e60b358c0c9db507f145285f1d0fc4aa99 SHA-256: 27c5af3fd53fa6d11856196027ac3ab782d70bc35cb17c724834b43be0dfa88c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The file's structure and link farm heuristic point towards an attempt to leverage SEO or distribute malicious content through compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdbaabd88---wavivelegewupugobisokodef.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef53f7bc50---pufazokaviluwewotitowavu.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01b5c068d---mefibukuwobu.pdf
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/20209414307.pdf
    • http://anhbanglaw.com/userfiles/file/pekepurajotiriralodab.pdf
    • http://alfavit.tv/userfiles/file/39207449088.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081794e9d588---roxebusarajujalinabarida.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc09e0b3e3---41382252052.pdf
    • http://tafgambiatours.com/userfiles/file/15686622846.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5a9f498883ae15795ba4b0cf0939f45c/rufetugakitobavebuvijim.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d43188c6---31971344084.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160985bfe32277---zisamofomoranuwo.pdf
    • http://elfuklid.cz/foto/Image/file/85322546181.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9e922b6f---lefavoza.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a71947ac670a07a1d75d6b269ca76f22/44125786146.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a7304cac---nelenifiramopuloduviviv.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58e8eb06f---9474995649.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e0732f0a---nagepefezex.pdf
    • https://angelsstaff.com/uploads/file/95632542485.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c667cfcabdd---dovevujafaju.pdf
    • http://assistance.uz/images/shared/file/fitexeguw.pdf
    • http://yuha.be/_files/file/gazewejotikadat.pdf
    • http://al-bandak.com/userfiles/file/tidazuboxef.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210608173714_960995228.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/nuvpipdrpsicancrpg943kcosu/kapezejibanadexen.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+k+mean+in+currency
    • 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_off00010542.bin
293539358b6b6b710fedabed965827bba50509e03da54e7e5467e8c474749732
pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10888 bytes
font_01_sfnt_off00011e4f.bin
e839691535a96fdb001cc9cd4c1d9668d2ae6dde3e00d19ec7f6968eb3bc89bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 17296 bytes
font_02_sfnt_off00014b58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B58 16792 bytes