Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a73099220acdb77…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 03:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ffdb7fef904dacb2d302e73cacf5521 SHA-1: c12974485d7b82db513adf05577aef7182e9f52c SHA-256: 4a73099220acdb77fde42ab20d277451924cbb8688d57435f57da7d6cf9abffc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://restauraceeverest.cz/userfiles/file/37596904862.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c2e36674c0ed54fdc206fff122ea04c2/26193100529.pdfIn PDF document text
    • http://gotween.com/userfiles/file///bojogemedomuvugo.pdfIn PDF document text
    • http://eventechsite.com/files/files/26681796230.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/99420537179.pdfIn PDF document text
    • https://davnosti.ru/upload/nudujakewaraxux.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/88861024895.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/900cd0ec69560e5a58ec723cedcff5bd/rawasovirunebisigas.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v6fgijap8lqj72v41cfercmpl5/zevidikuseg.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/88104527511.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/32744fe5d760bd753bab37db580889b5/noxefetajezosa.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/tobokojapibolavu.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/fasukamumetunixaxugab.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077864c637---zawezipikex.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/loweso.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/53041167497.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/93999276398.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/xexezuzuvepipagano.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/rulanosoxixuwugefafagiru.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4pn10llod81u2tneiral983jt6/mofaxulifofi.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/96063250181.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20d7db0d6---72177553314.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/74929623796.pdfIn PDF document text
    • http://dentherapia.hu/files/file/84167077362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=manual+instrucciones+lavavajillas+whirlpool+dwh+b00PDF 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 11248 bytes
SHA-256: 45eef1abf12ae3f33e5fa67de02596b4062020c0176c2017310834eea33f2596
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 18520 bytes
SHA-256: 641069b20f25957188434cfab112f52023aea0bfd400b9d194f8019028cfd7df
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1