Malicious PDF — malware analysis report

Static analysis result for SHA-256 169d27dcf76565fb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 11:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8064509b65a82ffe4c614e47258055b SHA-1: f21c62a51520f0ba7fdd7f6b84edeaba8bab677e SHA-256: 169d27dcf76565fb510ed35c8d7a09672cd5c961be2e3194b8322c78b1096c29
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the overall structure suggest an attempt to lure users to potentially malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://stef-nancy.fr/upload/document/tijiwenomik.pdf In PDF document text
    • https://abofahed.com/userfiles/file/puzereto.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9d0cd016dd18e49021d77cd5f3a0c756/vagutok.pdfIn PDF document text
    • http://didula.com/img/file/wasesunafarifidow.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/37912134469.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/13629175621.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb7cc19c5---lunodozupiwutemifebinoj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/80598907455.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/filosexevutixaremevil.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cbf7lauckvhgobbs4bb5eq24c0/53798078609.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f214a55a1d---63933712550.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/94161850667.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040612588792.pdfIn PDF document text
    • https://hsse.cl/files/bigawiwagivireved.pdfIn PDF document text
    • https://topupdana.com/contents/files/15516488022.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/354ba85d9c5002c5677ea697e766d11f/keripuzobap.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/tunovixijoseta.pdfIn PDF document text
    • http://tayles.com/uploaded/21768482473.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/tafewejof.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/vinorerifag.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/potigimunefakuxere.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/74697763981.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe22540a1---2564486077.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160793d1d08235---gijimimefuledefi.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/kaxiza.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b7c055ec---63228758768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=amaranto+beneficios+nutricionales+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_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 16924 bytes
SHA-256: 88c94f78701506e91987c6176450988ed01cb51b823758a1309f96afc4c180f0
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 11000 bytes
SHA-256: 56e2a20c1aee09b021beba409d82a476a3fc505cde4d78d11df0c1f3decf630c
font_02_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1