Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d2051af856c9ec…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 01:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb88224b22790786055ced48d1e5ac1e SHA-1: 9d02b6845f456127c2a413059f3906298208de81 SHA-256: 01d2051af856c9ecdd1ed65dd46900b3354278c47e4121684112ff4f49bff52e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=the+term+dyskinesia+is+defined+as+movement+that+is PDF link annotation
    • http://bulongvungtau.com/media/ftp/file/28001959512.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zukajemuwubu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c325dcd1e---rejamotowigixolaki.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/patiwituwoxerog.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/94479608144.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tunowofoledix.pdfIn PDF document text
    • http://clarasonic.com/upload/file/resuruvilivonu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b66cad28---32811680842.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fc5qkkvkd1vbo7r67drn9noaq3/3322539934.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/damidajewebozopotutu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ogkaft0f55f7mlq5h18svdale1/bumuluzopulo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b66d3b96437fc45d0f8419085a3fb2ca/80635284320.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/68b9af56839e73521d7828fe06fc8558/29089727813.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fec946b63---taxetuninozerogataz.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021082022491473499.pdfIn PDF document text
    • http://elitvorota.ru/f/file/pevugorefusamodokajilo.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/6381285109.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c306d64ed96---88747638916.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kirulixafozazoxodet.pdfIn PDF document text
    • http://guowangcable.com/d/files/rezolaxalazit.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/58091073973.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a322e492738---39901883878.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 22720 bytes
SHA-256: 6ddf9328eba4744cfece4f00095e1fee7ef68c8c5fb615dc4c90f167c2c50cb6
font_01_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 10808 bytes
SHA-256: ced6440157840554329d370ee058f60dd685e8920e7f24e64652c550cb04a1bc

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