Malicious PDF — malware analysis report

Static analysis result for SHA-256 8469456f2dc1144b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 00:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78e38d20ffc6cf17ab46a044484240cd SHA-1: 285f79cacf2130bdfdd1218575ea81f380f2c23a SHA-256: 8469456f2dc1144b726448535113e9f2a40ef890906d22223a03edd7d0a67cdd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely lead to phishing pages or malware downloads, as indicated by the ClamAV detection and ML classifier. The file's structure and URL patterns suggest a deliberate attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba26cbaeff1---zupitatulozefidofumegipoj.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcd00b0b5---30184307133.pdf
    • http://csc0851.com/userfiles/file/20210626200514_jnre4h.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/39805e6191fd977582231af449573a7d/23721384515.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3to57guu3o1pd0kc7mpqe16nt0/mafenelorataralowerixate.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867bebb6e5---38199406723.pdf
    • https://abofahed.com/userfiles/file/kulune.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071f488d2e68---koxig.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cd4259dae---dejivebivevexegezurixefi.pdf
    • https://educhina.mn/editor/files/65631973999.pdf
    • http://sl-light.ru/design/img/upload/file/91875828668.pdf
    • http://cloverdiamond.com/file/2385155008.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/85404027162.pdf
    • http://easyreturn.store/userfiles/file/saratifazunajalemipufu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160912b8005d92---44438392208.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/aa8b808abc2eb5547ead685301c15f1a/sigajojefugifuk.pdf
    • http://jonkmp.nl/img/cms/file/31201932191.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2ea995d725772995c8c90688f7deb9ba/kopebekizakupabesova.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbcb6b81b---pituturupobexoj.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ainaohalos82fn4j0thobuk83r/sowoxaguluxozagojaza.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcb8a4394---63382817112.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdef43da36e---gakotesalakadafapujosowo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=song+downloader+apk+for+pc
    • 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_off0000ec1a.bin
65e4da5ccb41990b14fefd45b46bee8483dc3a18d6ef3b8b86fb5fa1cb88aadb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 17040 bytes
font_01_sfnt_off000118ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 16792 bytes
font_02_sfnt_off000130c2.bin
19a4f0ad8a8efc17fd67ce3b056428c9c9a163bb425a7df532bf6f25d3557531
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 10692 bytes