Malicious PDF — malware analysis report

Static analysis result for SHA-256 1731c88931582629…

MALICIOUS

PDF

152.9 KB Created: 2021-06-30 04:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b88aac70fc6acf4ce70bd7f9cf4245ad SHA-1: 63963fb45046602d3906945904a756dc303a778d SHA-256: 1731c88931582629cfc832ca974b14ff9b9117d91ac0f87a0c3fe41ec5c9433c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=blackmagic+design+gpi+and+tally+interface+manual PDF link annotation
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/02kuuobklqsrmqicjrt506a31p/jiwigowejakopejowaki.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/528e52ab84dadc6ff63cd402680b99b0/fiwafurakatajitojaramo.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/vilukozenekajoxurenowil.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f00a035b---fipigubikudekeburama.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fc148f8fdaf048d832380e966e4dea66/wapajuxejoxamo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72147183459.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/77464741193.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e25559fc---piwevuvikav.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/45hj7l8tm67e4gims9ci7tqdd4/43021466599.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/mesenevivagogumiwopi.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0c426dbf1637a9012dd590370927591e/dedovulazided.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fad52ee2c46b00e37c6af25d76256be/libulugeveredatu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d99cea1a0---saxaxud.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081693873f32---teruduzoverino.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcf035335---11472201967.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979d08b52de---99140394082.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5d71cbe32a1b1d8708170a1b5f623cfc/pukegigusarokisi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c75b1d914e---27892282472.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/fokibinusotebi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef2c581532---duvasegaxuditonenaxonabi.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/77075412739.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1386a5e317---39542312227.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc09934c62---36712285978.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/13494135794.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_off0001f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4E8 11204 bytes
SHA-256: 1d7db40ce9c00b0a6b79329a0bdcda90c47ccac98061338fd2dde9883b3d8e66
font_01_sfnt_off00020ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EF5 17656 bytes
SHA-256: cbd21cf9ffa176bcee8446a560ad1a811292bf0c70e013e0b8f99f69800674e2
font_02_sfnt_off00023d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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