Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ec5c3c0a6d3034…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 19:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5d109b59fc637f9d97ce1d0e4fba206 SHA-1: fbabac4055df74074fbc55d93ce7c3716d9ce5f8 SHA-256: 27ec5c3c0a6d3034e9fab6fd1f44f36116685752d30191581f82b4e8e51b02c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of multiple distinct hosts and a high number of links suggests an attempt to obscure the ultimate destination or to maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ca1c69c8652352c37c32ef4d59346bc4/ninobubovowiwomonos.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/cc67b2c89e178165dfed5734d63b69a7/tuluvovem.pdf
    • http://brmhn.com/userfiles/file/20210529004747_228r7r.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a23tedrkuf647bkotj9766gdqr/muponeb.pdf
    • http://mikailang.net/userfiles/file/20210609014833_1445461386.pdf
    • http://lutechmed.com/Images_upload/files/94359021680.pdf
    • http://ahxxzx.com/userfiles/202106/file/solifomin.pdf
    • http://easyreturn.store/userfiles/file/tesupubini.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3bf6290046d4156a5a93beabba10150d/66785015101.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ogs3sn4r3le3uab5mar8gtq0cd/dokuw.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5ff12299db51127b3292400e8830f663/zasizexorotopasizu.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ef8f77ab1d898f662b6936b5c7964cbd/24045937650.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099687ea3248---66708659608.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/69d3f0c7965e0e18ce7eb1e56c037965/mozajikozimasojesal.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5a20fc8e---pakerulojuzubodo.pdf
    • https://ubranni.com/uploader/files/86981765780.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a008158f00b---77492652667.pdf
    • http://haozuowenwang.com/imagefiles/file/dogusudanumaranoletanim.pdf
    • https://altonika.pro/files/fck/file/zenev.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1da2ea504ee8071a0f4cd57d3192720e/ruzufiwovojibele.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b8466bf0c1d738e472937cb65cd1817f/ruxagojixom.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb52f14ce---73252106750.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5h1s9kmdihnutu28d34n5vafd4/80237393530.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3624ae52---85628299195.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lb4tcdo18u74lcerv0ftchn5o1/dafiwikesad.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/29suj0i0gjuqd7v70douafbss2/zemases.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=physical+fitness+form+for+job
    • 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_off0000edfd.bin
201957d75afe7ddfd438bb9cb5fd204583823297ed1a1fc0622d5f7a41f60c82
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10984 bytes
font_01_sfnt_off0001074d.bin
fd9db86688c114920f21f19c19f7469c69e94bb8b671796d55f68f2a9b5077f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16280 bytes
font_02_sfnt_off00013157.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes