Malicious PDF — malware analysis report

Static analysis result for SHA-256 940f2e611d27c8aa…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4717943d3ac97559e27f79d756c1d366 SHA-1: ade312ef061cd08241b5611f303b576fb43806ce SHA-256: 940f2e611d27c8aa419bb5a0607c521eac5a02456aff01251467dddc2022e39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links to compromised websites, suggesting it's used to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF acts as a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=how+to+hide+apps+in+android+without+any+app PDF link annotation
    • http://grubstreet.ca/ckfinder/userfiles/files/40832947738.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gogufepaxepunogabo.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/75009193027.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcee9e004b---94061098777.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/ninawezafulikibofan.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/20873230778.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/jakogipivugewomezaxugebam.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b9bf2e4d---89093793587.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/pofemudezawokuxedixat.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/fozovuxovis.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613394bb54cdd---jepob.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/49598439109.pdfIn PDF document text
    • https://maisonforville.be/documents/file/26090444210.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/60890405848.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/27915753751.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/figaxudusugup.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/kegedenikir.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/saletodoxigekuvera.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/53355000833.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/sinupiwu.pdfIn PDF document text
    • https://csn-alliance.com/data/files/70219976124.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/muleponi.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41495955424.pdfIn PDF document text
    • http://aven.su/userfiles/file/bogifilazoge.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 10732 bytes
SHA-256: ea1176f4768db64ec657f06c065c7a4b2afad1f61402383a303ad3d1e62c66b2
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 17976 bytes
SHA-256: 132dfd560cc708c512faad57116e8f55c98a3d952efa397f59b0a8cee10cacb4

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