Malicious PDF — malware analysis report

Static analysis result for SHA-256 92223515837173db…

MALICIOUS

PDF

77.3 KB Created: 2021-06-30 22:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b838739f462923174902d809ef6df65 SHA-1: 87ead6da3b0ebfcdce312525d0769b813b011e6a SHA-256: 92223515837173db38aec2f23a9d20e7200a4d14e8389b197ce27d7ae88cda47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the structure of the links suggest an attempt to obscure the final destination or leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/00lh1r6bumtilpv3lpg9908r2s/188769156.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/780404c29fac7168f65991951ac5f8f4/69073942213.pdf
    • https://zlatartopalovic.rs//files/67461501765.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/60eb6d5e74019912060787fcaffcc9a0/29728150190.pdf
    • https://zionapostolicministries.org/uploads/file/gafadufasonorol.pdf
    • http://otohyundaidanang.com/uploads/image/files/zebepojepobodojete.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a112ba9402---kubopok.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210627065743.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078316579c03---xazobutizuzajeta.pdf
    • http://m2m2design.com/userfiles/73653053575.pdf
    • https://nasroglobal.com/userfiles/file/86805280450.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6irvj3tub4qr4d1oqgsqgfoqd0/72192579014.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d7187d80---jaxuwifi.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d9d1b3005b85de55707c57617c6f8500/madakiledupijuv.pdf
    • http://rotarylaspalmas.org/documentos/file/18863666890.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdff1e047---1853165169.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/jajunikawirafepojuzazax.pdf
    • http://augustaelectricalwork.com/editorData/file/94705853459.pdf
    • http://goldmustang.com/files/files/jikomol.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/geworasobijanexugewob.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35e5b5ec3---gofopexofutujirariretefaz.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/79d80fbb8b6f8a0b3e438e7ca1465553/gujigenovotevotibolez.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a293247aea7e8a9af04425e0f145118f/rotaverinutebujufulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=questions+to+ask+a+guidance+counselor+in+an+interview
    • 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_off0000cc19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 16792 bytes
font_01_sfnt_off0000e430.bin
352c0c94e9719d9991ef54a68c3b3438d0367837c0cc8f33f7a72d1dc6527534
pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10948 bytes
font_02_sfnt_off0000fda5.bin
addbed99585ca2b77cae11ae2571b0bbf4ba7f6ebf1afda2c695283d29492f34
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 16248 bytes