Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aec8649b7ad6d7a…

MALICIOUS

PDF

79.7 KB Created: 2021-07-26 13:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff0ba73b4aadf8dea584ef8f145e2839 SHA-1: b26a7a902aa050c9ff7bd5cb05fdd2287a9f69c7 SHA-256: 5aec8649b7ad6d7a2aa42b1e98299ede5a232c3762afaca0e92b423dab10056f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is unreadable, but the heuristics and URLs confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4ed6b639d52e37a6e074fc8b72a1766c/suzop.pdf In PDF document text
    • https://nusantarabet4d1.com/contents//files/85427205108.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/3978dba2c4bbbdcb71e4504dc74474d1/11762772439.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/74729338234.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4no33jsd7e2mak3f05sopqs5ql/gugobizibazakogasa.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/11234729051.pdfIn PDF document text
    • http://omg.su/upload/File/gifawibiwodulevogi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/49010901708.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c989189d6e---tebemav.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/dunexobirunujagekuv.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ddc04e5c---46316477775.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609171f511291---47586087925.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4936926ca19bc223361ff17afd2dab8/vupibimudumejararozoguj.pdfIn PDF document text
    • http://morabia.fi/images/file/73586646396.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/gunilawajox.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65bc351d86---52462800618.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9bbb43957de0cb3dbcc598859d154b33/24080545635.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wixoni.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070137bcd1f4---foranem.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/31b04989ccc2370fd15c2764afcef0cd/dirigos.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec50916452---saxituleforuwubukoxubaxa.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/17449794085.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zaduxixofexutovoxubage.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8cbcd64---18373429386.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/3063550968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=degrees+of+adjectives+worksheets+for+grade+7PDF 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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 11032 bytes
SHA-256: 330b48a5bbbb7caac00af62f8a6a1bf1b5cb904877904728d877c580d6a1d2e7
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16832 bytes
SHA-256: c820f22cf23a1e86f2f18a5a10e57a525b2c916d24eb02ca54823be747288e94