Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f53b1d42a92033…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 07:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287040ba899e16fb9d592acff33d3a96 SHA-1: a1caf4e513d1afba9d241d5e037e278d13d66a79 SHA-256: 65f53b1d42a92033b05ed4b62ae98705a06dc9f71579e4906854842abdec9967
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure related to invoices or payment changes. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of these links and the lure indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=woocommerce+pdf+invoices+%26+packing+slip
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27ae6dec0c793d85b7fc0abdc6005dde/74005312059.pdf
    • https://sharadsangam.org/UserFilesTwo/file/81555704974.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/kivez.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a996a205a---telipurojelodumesavak.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0f4a790528d6fb45c70433e5b6b6b9d8/85666632273.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ce1b98424981c839a66b716116ea7dd1/savilixabeduwin.pdf
    • http://washchienluoc.com/upload/file/tojezenefoj.pdf
    • http://tpdw.pl/userfiles/file/satupebip.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d950c9f9c---medos.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/62111373780.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38ba62f4c7bb8a9fa90a8526edcc4893/betufidedebix.pdf
    • http://brianhaymore.com/images/e/file/5885546078.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087105aef887---2321961583.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04dacb85b---goxofaxomemer.pdf
    • https://citytrafik.nu/images/file/64341626922.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c657faab083---nivebe.pdf
    • http://thomasbelldescendants.com/clients/40432/File/sojitaporelivusu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b14101bb31b---jexolidili.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b1d8ec96---23805839312.pdf
    • http://kassa.pl/userfiles/file/mutibifiv.pdf
    • http://eros-arena.de/eros/userfiles/file/27042116179.pdf
    • http://polymer-optix.de/userfiles/file/25080013435.pdf
    • http://aquatherm-graz.at/files/52304680500.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bfa0019081a7c14dd03ec6c6f7860e67/39018344989.pdf
    • 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_off0000ec47.bin
a706f5f0adedc4915aa7b9821cf100b3bd75ee8b2bdc5c7c2c11e22a304ea3da
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 17056 bytes
font_01_sfnt_off000118db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 16792 bytes
font_02_sfnt_off000130f2.bin
bf16cd2e670523027cb6a6a154df9f2429ea1babaec507b4f4350d1d3b698c53
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 10532 bytes