Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd610b8dd731cdc…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 22:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f9f1a0d651e572b622fd52cb795c690 SHA-1: 02c03c93faf8aac94658fbc68b8a660ef81b6f30 SHA-256: ecd610b8dd731cdc8ebb6a597f6625d5aa34f109d98dcf780f3d18d5026d2180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of numerous distinct hosts and links indicates an effort to distribute malicious content widely.

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1700146a7---8477930560.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/41945e92ada2c7ab72e6bc2cd0ecaa24/57291507246.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/e5ca8c6afa50dda357914b0ff5ce84c8/56116489022.pdfIn PDF document text
    • http://ibb-online.ru/f/file/63635976075.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/depa081sij5ni06i3mubdaeur7/birupegojulopera.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/p2sed7llmbtjknh7j2o1ebobpn/xufolosozem.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d08ca4519---nogofuferu.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/toboxodakalijuk.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/38113897576f726407ff6d279a06b96e/laxomulenepomusi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0347qnmb08tiu3ed70s2a6tcav/pawerajob.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2106121523393777957etpa7ctagrt.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fdi46lkcgkqos5k37si5jq74t2/21846903185.pdfIn PDF document text
    • https://activepymes.com/pub/file/legev.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbefc4dd34---wamitekosepisizuzozeg.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608503767d364---ruvitumexopelosu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d276235e09---10970413613.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3164378a---momuzudur.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wenamidenanuwarota.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/tuzosuvelodog.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/47186621961.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dd2297fc7572918cd35b34a4416d3127/nefilikojefason.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7084909f9---77696410409.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/21609026411.pdfIn PDF document text
    • http://headrepublic.pl/images/files/selesuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+dumbledorePDF 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_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 17648 bytes
SHA-256: 52c14e488f641be71ae94561497dd2f0a7b0071173c6c08a81543f360b407d2d
font_02_sfnt_off000136f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 11036 bytes
SHA-256: 0b00a8e5acc4c0eb50140c45f5715ed54949af0209649ffd77bfaf9ed48145b5