Malicious PDF — malware analysis report

Static analysis result for SHA-256 9627e4ac54e6c363…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 10:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b34493bb0fb1f9c621c773c0d9139d78 SHA-1: 9e2df8128b7de39448716b6ad9e0f48f37ea4a28 SHA-256: 9627e4ac54e6c3633357bbf51840e37d5f226e0e490d2d40264e0b17610c2b71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0363904123947ba62e58833b3217274e/lemab.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/42f7e1f95bd200a15c32d580cce89637/divigusamonej.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jv1u7m02pns24pbcbuho3qtrup/bixudili.pdfIn PDF document text
    • http://esistore.de/userfiles/file/542386909.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3f548998e---tanifewet.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/12948420685.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/zibelenufez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c859d59f371---lewopuwiwekomabozapojujux.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/meroli.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/watok.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/gatakobepujaxulazowekuwak.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/vuribaw.pdfIn PDF document text
    • https://camelcarpet.org/d/files/74803755577.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3743ccb4---51346372471.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vibinana.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5c4c84a22902b3b885dbf27b4c774b11/nukozedabuxojedoporatase.pdfIn PDF document text
    • http://ezibra.pl/upload//file/25576440519.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210613_095033.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aratexazotex.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2cc6d32f62---51149537463.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db471a7fa0---52390350166.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/47832367014.pdfIn PDF document text
    • http://ausafe.net/images/art/files/63714399512.pdfIn PDF document text
    • http://ropesadventure.com/d/files/levej.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gokarerikuririmonemaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=reflexiones+para+tu+vida+pdfPDF 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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 19508 bytes
SHA-256: aea2e8025b95cd983493f20244fd63087751ade2629d9ebc9620e9a7ba954fc0
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 10804 bytes
SHA-256: 551796b84de5ad770deb6687de5eba3c2b6ac91d4fcff4f90dd3942c58aa227d