Malicious PDF — malware analysis report

Static analysis result for SHA-256 b026eb7d0a222d02…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 371ef1184ee76f15d2026a1fecddc158 SHA-1: 1c4a8be7576ffe4e493f36089f336a7306c61fb7 SHA-256: b026eb7d0a222d02696c91444099e7f8f11b01cac3486e614050cce055ac8b75
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains hosting further PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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 https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5faa55105d9f00405906e9c10fcf6e70/niworaxobedifelejadugebi.pdf In PDF document text
    • http://grandinspirations.com/clients/75274/File/xopatidon.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/78195378434.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa5267417---93612465625.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081693d32978---98215980478.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/lifepavulalamazogoka.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e16edb---64683810272.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/donezow.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c5667ed3---rutodozinojisikojol.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7704d7584---vetubufunaxuf.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b281db86d96954c1b213d85f74daaa4/tiduviju.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609298ca301de---19709082104.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609057ae27e74---ronipofinegil.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070962268340---56911831261.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ff21475b---50236704677.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nizigilibenakawiwuj.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0436933f4b---daguzase.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/34123522972.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e0101c6a---pamazupebusot.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4b864dac4ad3298b0cb479a7845fd6c2/kepisaxupewifanoji.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/58934763370.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jukf2uc016lbsairovai61a8t3/zobum.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370d567f1a---18039673881.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/57579316319.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce59079aa7---gowitunirezagofigafeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=stardew+valley+how+to+use+barbed+hookPDF 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_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 16828 bytes
SHA-256: b3c083c5aee299d82aa59fa537e8a2f1242dfc338676a73d100fabbc434f1312
font_02_sfnt_off00014536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14536 10824 bytes
SHA-256: 7db9f8e3c00a9259c89a5c50478e119a9e7c8d137bdb254429213dc5e340287d