Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a767e8b7022122…

MALICIOUS

PDF

88.4 KB Created: 2021-08-19 21:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be624f2e029ab38e10c133cc113be8b4 SHA-1: ded5e5c3c60e0c69654fb7006dc4e6bb6efc54f2 SHA-256: 45a767e8b70221228dccd4b03b0e1e907c815faf5be14959c8c1ecc7844d789a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5be27be0c---21933651075.pdf
    • http://kantoromega.pl/userfiles/file/davemeg.pdf
    • http://www.aportecnica.com/imagenes/editor/file/loxaxamufutorekev.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9484f00e8b941d4c4725dab08fed6221/39656295106.pdf
    • http://alnadaoil.com/userfiles/file/13693223617.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/53398be56bca3657cfd1f127be5c8af5/votekixuxubenalit.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5473e7b9622a01abd805d694a8a2a138/bijezuxujepa.pdf
    • http://bavlas.lt/ckfinder/userfiles/files/zofutak.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/89iphsgb41odee9fjjbtejhu7e/famobiwegutepo.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070684a05cff---46561203736.pdf
    • http://grawerlik.pl/userfiles/file/resetubuxux.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b5590a4d---migajadexajobokupubu.pdf
    • https://rcot.org/userfiles/file/luxavabofo.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/hkv1gesjvj1fa04lbndls1arg6/geruwurudukavawove.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9b697df8---87638286164.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/542d2gc9p0r5epdjhbg7cmogv1/zebuwujagazisa.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9845859a---mugubesibebogidavuvube.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/gupemipuzav.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611716c844b0e---46367109369.pdf
    • https://mygo.com/ckfinder/userfiles/files/52386598857.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nqtcu9tkps8najndgq88g89moo/nixukowefaben.pdf
    • http://cameradungphat.com/uploads/files/vubiwosulatimiwewowesiv.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01dcd28b1---kederezewaza.pdf
    • http://bannails.com/fckeditor_userfiles/file/92275296074.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8gqc7gk81s7kmmqq14a36i6pir/30751778390.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/zizojipusonijamuraluju.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/httplsbp92latafeuneccbc49a/91816164050.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=prova+de+portugues+interpreta%C3%A7%C3%A3o+de+texto+9o+ano+com+gabarito
    • 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_off0000e7d7.bin
e02f3b38497ad162ae396c1aac17d0c2fce99405c2e5c756655cc2e4e93c772c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 11852 bytes
font_01_sfnt_off0001032e.bin
094392ff9cc397f0fffd6468bd41b8f18a0d802205f31731540305a99f858071
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 21432 bytes
font_02_sfnt_off0001370f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 16792 bytes