Malicious PDF — malware analysis report

Static analysis result for SHA-256 8919a6a5f0ee80a7…

MALICIOUS

PDF

84.3 KB Created: 2021-07-17 18:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bacba03a4cd48aa8aacf4df3be66532c SHA-1: a1b9d9578dfe807ce537291c19da494bead4fcdd SHA-256: 8919a6a5f0ee80a73bfe4cf984453a336f3557dceb825c1b800c2d3609c965cd
184 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces the nature of this file as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6274962ab2a690e8f18c5dd0bcf99b22/fagedefuwazejugas.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16083d478328d6---17709611034.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5fcf612851bf749e13e46a84ff788fd7/dowakopuvokugetevulexa.pdfIn PDF document text
    • http://k1a.ru/images/files/file/zanelulejuzojamufufojukel.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/sabodovabupometanun.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/94493186321.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d84eb0934---varipofelas.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531b12909e.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/murenusarixanewu.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kedekof.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090639660768---tavoxabofinutasikoxur.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/kedebevemoluse.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4qtcksnfhlr37iccig5baa7rqi/namojaxitowanisatizirezem.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b474466612a---27614537668.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qgsdp07irbfbtetnkfkvodurpq/48061546495.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/jagagogufunad.pdfIn PDF document text
    • http://simonide.org/userfiles/file/98930831949.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/sebimaroli.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/59761ae7d90c258fef45654fa92ebbcd/4017546918.pdfIn PDF document text
    • http://bptramptour.pl/files/file/kefejomufekavibarizisi.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/36102239447.pdfIn PDF document text
    • http://fygl.net/uploads/file/181110199471.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9fce24c266793e94017233ae20e6b53b/famosalawelakarasegu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/96b8eeb704ba629ec9c408a09024be0f/52823200551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+have+a+dba+under+an+llcPDF link annotation
    • 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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 10416 bytes
SHA-256: 6de6b4c6d23c62b4e68c9319038ff135b9c24ceeb21bb3480644742137c4020c
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 17180 bytes
SHA-256: 45724c1038e9617b17d96904bd5c6b3164307c74e89f39c64358ef58b1a7837e
font_02_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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