Malicious PDF — malware analysis report

Static analysis result for SHA-256 97874bdfce9cf0ab…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 10:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a873e50ee54eb76c4faf6e2f11996edb SHA-1: f2ead27073b94454e6fd7616022daf4c7c6e4217 SHA-256: 97874bdfce9cf0abdde0d9f61b215bed8e5cf68bb297ebdfe37e0bfa9b9e9a0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://projetovm.com/uploads/files/pobalikarikonifo.pdf
    • http://daimarconstrucciones.com/images/admin/file/88401577548.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/44415683706.pdf
    • http://galluccifaibano.com/userfiles/file/85774285926.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/9858917374.pdf
    • https://laznia-radom.pl/userfiles/file/xivegagaxeterotinod.pdf
    • http://historia-bfured.hu/userfiles/file/kemusuzubugugopolone.pdf
    • http://surmounttravel.com/userfiles/files/17266903295.pdf
    • http://thebankcardservice.com/uploads/files/wivoxikejufozogowefiw.pdf
    • https://mr-alian.com/upload/ckfinder/files/97646317972.pdf
    • http://amirafouad.com/uploaded_files/file/verararazeb.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/93976989796.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/47662862669.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/mutenodusupulup.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/18454370740.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/36469288028.pdf
    • http://jump360.co/upload/files/20210904070254.pdf
    • http://citescolairedeledit.com/include/file/zedekosenutegagalinobizu.pdf
    • http://duda-tech.pl/dudatech/upload/file/61893494867.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8t0jeseah623lnmd2eknspubco/79754959135.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0dea9cc7167fb35540f715ed0464fc4a/muromewutudipulesesujax.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/bodotosunotulugoxabux.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/vovevawepog.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8188ca7425fd6b1cff1bcf2558b958b1/mudoxusitolozeda.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sas+4+unblocked
    • 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_off0000d94b.bin
7ad3475f203f451295d79d05fec597e07e1096f5a78c619133f9451e12f8432b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 17312 bytes
font_01_sfnt_off000105de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 16792 bytes
font_02_sfnt_off00011df5.bin
af79287fcf0021b5fce850f6c5f54ab415ea08f554b824e9e744c364eef6e3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 10556 bytes