Malicious PDF — malware analysis report

Static analysis result for SHA-256 5870bd6076f15845…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 23:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28ad56be28e8ff3422127032c14dd714 SHA-1: 377aa97676d3008af67d98afe4301e3d7141638e SHA-256: 5870bd6076f1584543525f501f7bb1179fa0d7d1606c5ef837a901209fcfa880
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=suma+resta+multiplicaci%C3%B3n+y+divisi%C3%B3n+ejercicios+pdf PDF link annotation
    • https://kolbandibileklik.com/resimler/files/zufipixi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160faab0cf27df---jadedi.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/luzalomumofafuluvulew.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/61737170727.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd57b30ab02---kujazirofimavitetoti.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikev.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/221e4a0a07bd799f94846cc39d74df13/dazodezajikumaxufax.pdfIn PDF document text
    • https://egf.tw/test2/images/file/74323434632.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/38675615414.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b5d5f320---95081271387.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d750e7ed38---55607468697.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b437ede4---mexenedemo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/37014790245.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2267a2db4---gabuwobopikukodupuwovo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8105ca8ad9---98584118525.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tbpe9lian17ebfi0apn7oed377/wolazotimimogewe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1278eaf58ad99424122d119dc15f0322/samotibewuwanobaloz.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a3b1c8aa500ac83d7c4d76cadfff01ca/93584824364.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/80857744102.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44bb76e92e---putogudaxevejakajofuxorif.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/19011c1ce78150bbba9a9515564aa719/96095870301.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9099fc522b6ec621fa1039657b162edc/zilir.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82d28d3839---denubudavotedimojizukigo.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/12716271105.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0a33bbf34bb8314881afe886d01e80f9/80479274283.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_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 19084 bytes
SHA-256: 041c1c8bb6f52c07000fb77f3804e6db649c6a8da0ee4f65c781f5c3dcb33523
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 11404 bytes
SHA-256: aa71010846bbb4ac6af9c92ca634c7320b2af5e2aec471909ca0cb1f96c93755

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