Malicious PDF — malware analysis report

Static analysis result for SHA-256 f325ef643851e870…

MALICIOUS

PDF

91.2 KB Created: 2021-08-02 19:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 451be35247b454278c96d99dd5d63d0e SHA-1: dbbf390318510315f8df43958740935c02a3203a SHA-256: f325ef643851e8706c3dd10fdfc7424583afd8893ad875a17af1506de7101690
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ba07e66fddd0c7bddcdc80c8b5427f40/magegazulinukukeras.pdf In PDF document text
    • https://eravukappalpalli.com/userfiles/file/muwulegebunabiduxejasuk.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/63031387414.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/6584352742.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7sjs7pr3gv1n0jvg4qndvhk8oo/lixasuvoli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa8c1d7d50---10448306631.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/fidiginupipizumep.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2866d4ea0---zaguvavizutikimak.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083019244ba1---11176598723.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/nefewuziguwanujerajuxid.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/82783921418.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0a2962947be87d38463c63944e3bf5a5/1516272318.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/9289191593.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a176471305e---97663680493.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/xijad.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/udf79ovi19shnphljakmem2qdb/79159206670.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ccd7a65a---13538280825.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/45329964927.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160993625069b7---50509765086.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607293445eba0---ripezugalomopane.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/le597sfm9tlv118nsm6g40v7nv/67384192382.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160724a2d1d310---dinuruxodepururokituvi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/134feh82urt4gf8jqsbblkhck8/1859925692.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/lirav.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160de2ecbaeea2---27267126811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+movies+unblocked+2020PDF 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_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 10888 bytes
SHA-256: b52dc5a0d6648f1f05ab4e7b1beafbcd3d7eebfd6d4832be10f4a8398145ef44
font_01_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 17264 bytes
SHA-256: 9abf7d0b0ca319e5e4ff5ce5b40ba99ca9e9b536ac0b0dc84132ecbf631183ed