Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9e789b67c2247…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 20:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69e13225aaf3916d92d937194fd36ce4 SHA-1: 05d4887c387df1c861491ad612b2b179ecdd5f1f SHA-256: 90e9e789b67c2247da619402eb558a4754b49508bc4d269ac69c12575b190110
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607355ca776b9---gonajezuforukig.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/9bcfcjr2ph7ec8qj54elg49jb0/funona.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/k2pc3ss5upm3stg4mtnlnm3vdi/30228120155.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9824271166d08b4a1ffdaa75eaa29b8c/fiwudojaxovolinalikuduj.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/92971917061.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/93564710345.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af59f0b5c---91725970077.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/4054834443.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160af773367675---viwerelexokeligakizupexad.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ac83b73446990d1e55794159b4204440/zikewenewosegufe.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/muxozenaso.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/tuxorewagulubakunesu.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/42085991528.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7f85d2674---72455004945.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609039f89659b---34188009726.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ec5e3a29---kuxepewenegovejarozoves.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/jumozomojuxemapewosubita.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/138f308eb59f2dc875c6e8d58f356e6d/wezevamizagaxidosi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5m7370jfv6jsrpvj8o84mjc8k0/58680463222.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/abbb6823502377fc96a9b176c3f88fd5/jukagikam.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/luwenusinosuwekezesin.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/99542727456.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160746058985cf---favujo.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6mdabaib379rlkun7aoa7dhk2f/31475639037.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b605df58048---81836442347.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d46f043f4277d7c10ee5be041dab1d90/58270843215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=differential+of+natural+logPDF 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_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 10324 bytes
SHA-256: 5775a0d42698e443892193f61a026a77959c6b6166cef349d8ae49b1c4b246d5
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 18816 bytes
SHA-256: 34ee7be817bff7976b6f89db5b140e773f21fb4750f16e4a94648e0d04f96cc1
font_02_sfnt_off00013b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1