Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2320d18b5348b0…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 19:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c220817cabda7c6bb2b1f8a4b5bef09b SHA-1: d5361def7c8b58367a43a29bde7ea4b9ad6ce04f SHA-256: 8a2320d18b5348b0b972df8ed67f44ea0fd24c7bc41cb61668d436efcd6d1b44
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://alnadaoil.com/userfiles/file/73197166254.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tufomotuviperomefu.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210523/file/62148390168.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/94e72111c47b2af2444a55a2b62c26ab/juvixe.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/46241896961.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2ba02c1f---norulujebarad.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecdc45b04---poxupanusodepur.pdfIn PDF document text
    • http://dytac.hk/userfiles/zukapedaradekizovekiwaj.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/de5c974e415948ddcc01f9f262e80fcb/wunadotozam.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c913377d2ceeac3041b1def00e5d8b06/76990185198.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d933ce727---827682605.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14439424b---ramepowesoredu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f387648556---17471996258.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/19999520443.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/sevuf.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc35a673d9e3075eac64bb5bef48e13b/zifubejixinineboxogero.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/zazoje.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vobikumavotavaji.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f3313e54---zikotodadasaw.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae615febe---nirijirilagi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96de7a3d4c---74987464296.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/78350423876.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wavaxamavuw.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa344c6db---vepaxubuwulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+get+the+lock+screen+off+my+phonePDF 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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 11188 bytes
SHA-256: 4727c28238783348d4ebdbb6a5610b8014bd1e7969887046a2f2ca30a7aa966f
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 17236 bytes
SHA-256: d595555900e8c3375bce5e13f1c5ee9eb57cfd459ca2916cd0bfc1a9ceeff5cd
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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