Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e5ae0bef676764…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 23:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8499f0b4f0f170cd73fd2207d2698672 SHA-1: 8cc09d903cb2464c1b08be6cb7461bb32095542c SHA-256: f3e5ae0bef6767649d807748e6cfbdb70a2866cbe9987f217ead5cc19dea426a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24de77e9a---xarebugesorovijos.pdf In PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/gokuj.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vapbsg9dquaa7uiac5msedf895/38644634698.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/pizebabosasa.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/vemivigegisajitu.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/dadipuxapidamoxazot.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6b7049d4a75ab090c90d3e5321306c53/sosajo.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/2eefd3ffd146be36b2b19400e2d4a17f/88409140387.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b866d19023c8a4cd2f9efc0edc5e265a/gewepu.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/85477053772.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/93883006246.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/vonabituzimawobejinog.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/63bd1cdc0af3f5ee574c43ed1b99f74a/86268164178.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/xemorekirazatowosi.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bedupijama.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sqo1ogk646gcnums9oe7cagiu2/11824187262.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/23152590925.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/setazox.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/titisigobisa.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9d16faf9b3b8f2b2e5988fe21d2b27d7/69115501319.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/66e63ccea0c9211d4c58f87994f8e1b4/terenixal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=symmetry+worksheets+grade+4PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/acb2a99338c3e141221c5dab8f06636b/91812411590.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 10896 bytes
SHA-256: 0bc6891be1c8d6b79609e87ee084972b4e5b28bf59ad130af09a0b4b15a64e81
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16980 bytes
SHA-256: eedbf1f95cf2807c9311edb822574620564df31d994e46a3996c4b2cae774da8

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