Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28671313ef864a7…

MALICIOUS

PDF

90.3 KB Created: 2021-08-24 19:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00369df3c6fbd5bcd9d1665ab7be125b SHA-1: 3427650a57db8f06c11156dd089fb3bc220f3afb SHA-256: b28671313ef864a72c1ebbfd7dcb04720c6dcb936d280ec8131e088473060d8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crysiq.ru/uplcv?utm_term=experience+letter+for+mechanical+engineer PDF link annotation
    • https://legyenegyjonapod.hu/userfiles/files/83663959366.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae737561b---megoteda.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/jatupirarepa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d85d5fa6---6927056153.pdfIn PDF document text
    • http://clingac.com/d/files/13137477625.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rubusonigozokef.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/73735871040.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210801202930.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/74681442306.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cae714eb4---vobonafexilitozixen.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/bowuvesofapu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/848127008.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/40935266697.pdfIn PDF document text
    • http://tochalco.com/uploads/files/12128479117.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cpb9vop8116adl2tbk42gtv45e/lebumagef.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3a981fca---serax.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/iahqpnp6f7p627hbn136tod53s/66082832270.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/77688147674.pdfIn PDF document text
    • http://darec.sk/files/files/razitored.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/torifonopubivazigele.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/resofadibuzol.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/gufidelutoravuwudototaru.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/87585460419.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/penadibu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4a4f467f918169fe155e27a292637df5/14776186496.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/monenewabefadipe.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_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10844 bytes
SHA-256: b99ebef36c10660d350dd78109601e8dc024235992716548bc5a2a0e3935929a
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 17640 bytes
SHA-256: e4c5173604c377f394cf0a09d5b59c4cf2bb6e19fa7bff89e45ee4534c018044

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