Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1999a590d15b8d…

MALICIOUS

PDF

85.4 KB Created: 2021-07-22 08:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a558308ea4ad85ceddc0fc9d88ca4f2d SHA-1: a3e52f1b20da0e70e51102afb752e0bfcfd64fcb SHA-256: 5a1999a590d15b8d63dac33d750a9db8e70bd3be68037252bd2bb002fdd5ae1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608620f271c33---zigufifu.pdf
    • http://inncredel.com/uploads/metobunotos.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ea8465255---35581674563.pdf
    • http://njf724.com/basefile/janatalnajafcom/files/zojukizapabakofubujexidew.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd62c56f71---moribe.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fa2cf116057d71c4e4b8e571ce6055c3/26506514023.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d183ec7431b---lezudamuxopus.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607925aca4a6e---fidinazubizosej.pdf
    • http://i-daa-wl.de/userfiles/11479623736.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a83aabace4ff89752a08bb1e8ca5b6e2/gofavojisukinelinedufux.pdf
    • http://denkobarbell.com/_upload/files/kiwezo.pdf
    • http://ladyvenus.it/userfiles/files/dedesiwukafed.pdf
    • http://andlupa.com/userfiles/file/voxazefalugilukex.pdf
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/sonefuvimowexaroxupenuto.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609badc61bbe4---nikuxefa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9e2098c3---2220455043.pdf
    • http://01host.ru/userfiles/files/vegebepajawakixawiwipim.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/53772080664.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ukm4osvcph6k5bhlf71etm1q5h/57998055965.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899c53a0e5---kijekudopuma.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7gd9dbcgmctqe87s3v6l4jcrg2/loborixagubevu.pdf
    • http://ozkayalartrans.com/userfiles/file/18655080042.pdf
    • http://on-video.com/movies/movie_data/file/26763241213.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/048f883777bb97ea7b010d860e549e6f/55143406470.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081709844c9b---risewitotuboguze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lizzy+greene+and+aidan+gallagher
    • 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_off0000e5da.bin
d8c2733cab2d3da442cec178cff9a871cddead387c3395571e1f681c04126ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 19564 bytes
font_01_sfnt_off00011818.bin
ca75ae63bcf7563a8eb3fa23b728e6dc0205457540459e65e596273989444402
pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 10272 bytes
font_02_sfnt_off00012ed9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 16792 bytes